Cycling Hardening and Serration Yielding of Fe-Ni-Cr Alloy at High Temperature under Out-phase TMF

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 24; no. 3; pp. 428 - 431
• Main Author: He, Qingfu
• Format: Journal Article
• Language: English
• Published: Heidelberg Wuhan University of Technology 01.06.2009; Springer Nature B.V
• Subjects: Behavior; Chemistry and Materials Science; Fe-Ni-Cr合金; High temperature; Materials Science; Precipitation; Weather forecasting; 材料科学; 金属材料; out-phase; serration yield; hysteresis loop; isothermal cycling; cycling hardening
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-009-3428-y

Behaviour of hardening and serration yield of a Fe-Ni-Cr alloy under isothermal cycling （ISC） and out-phase TMF was studied on the basis of varied hysteresis loops. Cycling hardening and serrated yielding for ISC depend on the temperature and the total strain range, stronger hardening with serrated yielding at higher strain range under ISC at 600 ℃, but no hardening and serrated yielding occurred under ISC at 800 ℃. Stronger hardening with stress serration occurred at the thermal path going to the lowest temperature, no stress serration occurred at the highest temperature under the out-phase. The hardening also depends on the total strain range, higher total strain range with lower cycling temperature resulted in a stronger hardening and remarkable serration yielding behavior. Weaker hardening without serrated yielding occurred at near 800℃ may due to an obvious cycling stress drop under out-phase TMF. Change in the shape of the hysteresis loops also expresses the degree of the damage of the tested alloy under out-phase and ISC.