Improvement of delayed fracture resistance on chrome molybdenum steel bolt by cavitation peening
In order to demonstrate the effect of cavitation peening on crack initiation stage of hydrogen-charged materials with the objective of industrial application, and suppression of the delayed fracture of bolt, the delayed fracture test was conducted under constant load after hydrogen charging. The obt...
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| Published in | Kikai Gakkai ronbunshū = Transactions of the Japan Society of Mechanical Engineers Vol. 82; no. 842; p. 16-00111 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
The Japan Society of Mechanical Engineers
01.09.2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2187-9761 |
| DOI | 10.1299/transjsme.16-00111 |
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| Abstract | In order to demonstrate the effect of cavitation peening on crack initiation stage of hydrogen-charged materials with the objective of industrial application, and suppression of the delayed fracture of bolt, the delayed fracture test was conducted under constant load after hydrogen charging. The obtained results show that fracture surface at an origination of the delayed fracture took on intergranular fracture, and fracture occurred in a moment after crack initiate from stress concentration portion such as root of thread potion and incomplete thread. That is to say, evaluation of crack initiation stage of hydrogen-charged materials can be achieved by the delayed fracture test. Threshold stress σth of the delayed fracture was increased by cavitation peening and kept on increasing with processing time of cavitation peening. σth increased from 327 ± 22 MPa to 505 ± 42 MPa due to cavitation peening with tp = 6 s/mm. This effect was caused by introduction of compressive residual stress at root of thread potion, where subject to be fracture origin. |
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| AbstractList | In order to demonstrate the effect of cavitation peening on crack initiation stage of hydrogen-charged materials with the objective of industrial application, and suppression of the delayed fracture of bolt, the delayed fracture test was conducted under constant load after hydrogen charging. The obtained results show that fracture surface at an origination of the delayed fracture took on intergranular fracture, and fracture occurred in a moment after crack initiate from stress concentration portion such as root of thread potion and incomplete thread. That is to say, evaluation of crack initiation stage of hydrogen-charged materials can be achieved by the delayed fracture test. Threshold stress σth of the delayed fracture was increased by cavitation peening and kept on increasing with processing time of cavitation peening. σth increased from 327 ± 22 MPa to 505 ± 42 MPa due to cavitation peening with tp = 6 s/mm. This effect was caused by introduction of compressive residual stress at root of thread potion, where subject to be fracture origin. |
| Author | KUMAGAI, Naoki TAKAKUWA, Osamu SOYAMA, Hitoshi |
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| Copyright | 2016 The Japan Society of Mechanical Engineers |
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| References | Beachem, C.D., A new model for hydrogen-assisted cracking (“hydrogen embrittlement”), Metallurgical Transactions, No. 3, Vol. 2 (1972), pp. 441-455. Soyama, H. and Macodiyo, D.O., Fatigue strength improvement of gears using cavitation shotless peening, Tribology Letters, Vol. 18, No. 2 (2005), pp. 181-184. Macodiyo, D.O. and Soyama, H., Cavitation shotless peening for improvement of fatigue strength of carbonized steel, International Journal of Fatigue, Vol. 25, Nos. 9-11 (2003), pp. 1217-1222. Soyama, H., Enhancing the aggressive intensity of a cavitating jet by means of the nozzle outlet geometry, Journal of Fluids Engineering, Transactions of the ASME, Vol. 133, No. 10 (2011), pp. 101301-1-11. Soyama, H., Material testing and surface modification by using cavitating jet, Journal of the Society of Materials Science, Japan, Vol. 47, No. 4 (1998), pp. 381-387 (in Japanese). Soyama, H., Shimizu, M., Hattori, Y. and Nagasawa, Y., Improving the fatigue strength of the elements of a steel belt for CVT by cavitation shotless peening, Journal of Materials Science, Vol. 43, No. 14 (2008), pp. 5028-5030. Takakuwa, O., Nishikawa, M. and Soyama, H., Numerical simulation of the effects of residual stress on the concentration of hydrogen around a crack tip, Surface and Coatings Technology, Vol. 206, Nos. 11-12 (2012), pp. 2892-2898. Soyama, H., Enhancing the aggressive intensity of a cavitating jet by introducing a cavitator and a guide pipe, Journal of Fluid Science and Technology, Vol. 9, No.1 (2014), JFST0001, pp. 1-14. Hojo, T., Sugimoto, K., Mukai, Y. and Ikeda, S., Effects of aluminum on delayed fracture properties of ultra high-strength low alloy TRIP-aided steels, Tetsu - to - Hagane, Vol. 93, No. 3 (2007), pp. 234-239 (in Japanese). Bockris, J.O'M., Beck, W., Genshaw, M.A., Subramanyan, P.K. and Williams, F.S., The effect of stress on the chemical potential of hydrogen in iron and steel, Acta Metallurgica, Vol. 19, No. 11 (1971), pp. 1209-1218. Watanabe, Y., Hasegawa, N. and Inoue, M., Effect of shot peening on delayed fracture of high strength steel, Journal of the Society of Materials Science, Japan, Vol. 41, No. 465 (1992), pp. 933-938 (in Japanese). Hagihara, Y., Ito, C., Hisamori, N., Suzuki, H., Takai, K. and Akiyama, E., Evaluation of delayed fracture characteristics high strength steel based on CSRT method, Tetsu - to - Hagane, Vol. 96, No. 6 (2008), pp. 215-221 (in Japanese). Matsuyama, S., Delayed Fracture, Nikkan-Kogyo Press (1989) (in Japanese). Takakuwa, O., Mano, Y. and Soyama, H., Suppression of hydrogen invasion into austenitic stainless steel by means of cavitation peening, Transactions of the JSME, Vol. 81, No. 824 (2015), 14-00638 (in Japanese). Hagihara, Y., Oba, T., Hisamori, N., Suzuki, H. and Takai, K., Effect of plastic strain and preloading on delayed fracture characteristics on high strength steel, Tetsu - to - Hagane, Vol. 97, No. 12 (2012), pp. 623-630 (in Japanese). Saito, M., Effect of shapes on the delayed fracture strength of high strength friction grip bolts, Electric Furnace Steel, Vol. 43, No. 1 (1972), pp. 12-20 (in Japanese). Takakuwa, O. and Soyama, H., Suppression of hydrogen-assisted fatigue crack growth in austenitic stainless steel by cavitation peening, International Journal of Hydrogen Energy, Vol. 37, No. 6 (2012), pp. 5268-5276. Yamasaki, S. and Takahashi, T., Evaluation method of delayed fracture property of high strength steels, Tetsu - to - Hagane, Vol. 83, No. 7 (1997), pp. 454-459 (in Japanese). The Society of Materials Science, Japan, Standard evaluation method of fatigue reliability for metallic materials－standard regression method of S-N curves－ (2002) (in Japanese). Matsumoto, Y., Takai, K., Ichiba, M., Suzuki, T., Okamura, T. and Mizoguchi, S., Reduction of delayed fracture susceptibility of tempered martensitic steel through increased Si content and surface-softening, Tetsu - to - Hagane, Vol. 99, No. 3 (2013), pp. 236-244 (in Japanese). Yokobori Jr., A.T., Nemoto, T., Satoh, K. and Yamada, T., Numerical analysis on hydrogen diffusion and concentration in solid with emission around the crack tip, Engineering Fracture Mechanics, Vol. 55, No. 1 (1996), pp.47-60. Klingler, L.J., Barnett, W.J., Frohmberg, R.P. and Troiano, A.R., The embrittlement of alloy steel at high strength levels, Transactions of American Society for Metals, Vol. 46 (1954), pp. 1557-1598. Nakasato, F., Delayed fracture of bolts, Tetsu - to - Hagane, Vol. 88, No. 12 (2002), pp. 20-25 (in Japanese). Saito, M. and Takaya, H., Study on the effects of cold- and warm- Thread rolling on the delayed fracture strength, Electric Furnace Steel, Vol. 43, No. 1 (1972), pp. 21-26 (in Japanese). Shiraishi, T., Yamada, K. and Kunio, T., Experimental analysis of the fracture process of cathodically charged SNCM 8 steel, Transactions of the Japan Society of Mechanical Engineers, Series A, Vol. 54, No. 497 (1988), pp. 154-158 (in Japanese). |
| References_xml | – reference: Beachem, C.D., A new model for hydrogen-assisted cracking (“hydrogen embrittlement”), Metallurgical Transactions, No. 3, Vol. 2 (1972), pp. 441-455. – reference: Takakuwa, O., Mano, Y. and Soyama, H., Suppression of hydrogen invasion into austenitic stainless steel by means of cavitation peening, Transactions of the JSME, Vol. 81, No. 824 (2015), 14-00638 (in Japanese). – reference: Klingler, L.J., Barnett, W.J., Frohmberg, R.P. and Troiano, A.R., The embrittlement of alloy steel at high strength levels, Transactions of American Society for Metals, Vol. 46 (1954), pp. 1557-1598. – reference: Soyama, H., Shimizu, M., Hattori, Y. and Nagasawa, Y., Improving the fatigue strength of the elements of a steel belt for CVT by cavitation shotless peening, Journal of Materials Science, Vol. 43, No. 14 (2008), pp. 5028-5030. – reference: Hagihara, Y., Oba, T., Hisamori, N., Suzuki, H. and Takai, K., Effect of plastic strain and preloading on delayed fracture characteristics on high strength steel, Tetsu - to - Hagane, Vol. 97, No. 12 (2012), pp. 623-630 (in Japanese). – reference: Saito, M., Effect of shapes on the delayed fracture strength of high strength friction grip bolts, Electric Furnace Steel, Vol. 43, No. 1 (1972), pp. 12-20 (in Japanese). – reference: Soyama, H., Enhancing the aggressive intensity of a cavitating jet by means of the nozzle outlet geometry, Journal of Fluids Engineering, Transactions of the ASME, Vol. 133, No. 10 (2011), pp. 101301-1-11. – reference: Macodiyo, D.O. and Soyama, H., Cavitation shotless peening for improvement of fatigue strength of carbonized steel, International Journal of Fatigue, Vol. 25, Nos. 9-11 (2003), pp. 1217-1222. – reference: Shiraishi, T., Yamada, K. and Kunio, T., Experimental analysis of the fracture process of cathodically charged SNCM 8 steel, Transactions of the Japan Society of Mechanical Engineers, Series A, Vol. 54, No. 497 (1988), pp. 154-158 (in Japanese). – reference: Bockris, J.O'M., Beck, W., Genshaw, M.A., Subramanyan, P.K. and Williams, F.S., The effect of stress on the chemical potential of hydrogen in iron and steel, Acta Metallurgica, Vol. 19, No. 11 (1971), pp. 1209-1218. – reference: Watanabe, Y., Hasegawa, N. and Inoue, M., Effect of shot peening on delayed fracture of high strength steel, Journal of the Society of Materials Science, Japan, Vol. 41, No. 465 (1992), pp. 933-938 (in Japanese). – reference: Yamasaki, S. and Takahashi, T., Evaluation method of delayed fracture property of high strength steels, Tetsu - to - Hagane, Vol. 83, No. 7 (1997), pp. 454-459 (in Japanese). – reference: Yokobori Jr., A.T., Nemoto, T., Satoh, K. and Yamada, T., Numerical analysis on hydrogen diffusion and concentration in solid with emission around the crack tip, Engineering Fracture Mechanics, Vol. 55, No. 1 (1996), pp.47-60. – reference: Soyama, H. and Macodiyo, D.O., Fatigue strength improvement of gears using cavitation shotless peening, Tribology Letters, Vol. 18, No. 2 (2005), pp. 181-184. – reference: Matsuyama, S., Delayed Fracture, Nikkan-Kogyo Press (1989) (in Japanese). – reference: Matsumoto, Y., Takai, K., Ichiba, M., Suzuki, T., Okamura, T. and Mizoguchi, S., Reduction of delayed fracture susceptibility of tempered martensitic steel through increased Si content and surface-softening, Tetsu - to - Hagane, Vol. 99, No. 3 (2013), pp. 236-244 (in Japanese). – reference: Soyama, H., Material testing and surface modification by using cavitating jet, Journal of the Society of Materials Science, Japan, Vol. 47, No. 4 (1998), pp. 381-387 (in Japanese). – reference: The Society of Materials Science, Japan, Standard evaluation method of fatigue reliability for metallic materials－standard regression method of S-N curves－ (2002) (in Japanese). – reference: Hojo, T., Sugimoto, K., Mukai, Y. and Ikeda, S., Effects of aluminum on delayed fracture properties of ultra high-strength low alloy TRIP-aided steels, Tetsu - to - Hagane, Vol. 93, No. 3 (2007), pp. 234-239 (in Japanese). – reference: Saito, M. and Takaya, H., Study on the effects of cold- and warm- Thread rolling on the delayed fracture strength, Electric Furnace Steel, Vol. 43, No. 1 (1972), pp. 21-26 (in Japanese). – reference: Takakuwa, O., Nishikawa, M. and Soyama, H., Numerical simulation of the effects of residual stress on the concentration of hydrogen around a crack tip, Surface and Coatings Technology, Vol. 206, Nos. 11-12 (2012), pp. 2892-2898. – reference: Nakasato, F., Delayed fracture of bolts, Tetsu - to - Hagane, Vol. 88, No. 12 (2002), pp. 20-25 (in Japanese). – reference: Hagihara, Y., Ito, C., Hisamori, N., Suzuki, H., Takai, K. and Akiyama, E., Evaluation of delayed fracture characteristics high strength steel based on CSRT method, Tetsu - to - Hagane, Vol. 96, No. 6 (2008), pp. 215-221 (in Japanese). – reference: Takakuwa, O. and Soyama, H., Suppression of hydrogen-assisted fatigue crack growth in austenitic stainless steel by cavitation peening, International Journal of Hydrogen Energy, Vol. 37, No. 6 (2012), pp. 5268-5276. – reference: Soyama, H., Enhancing the aggressive intensity of a cavitating jet by introducing a cavitator and a guide pipe, Journal of Fluid Science and Technology, Vol. 9, No.1 (2014), JFST0001, pp. 1-14. |
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| SubjectTerms | Bolt Cavitation peening Delayed fracture Fractography Hydrogen embrittlement Residual stress |
| Title | Improvement of delayed fracture resistance on chrome molybdenum steel bolt by cavitation peening |
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