Mechanism of grinding-induced burns and cracks in 20CrMnTi steel gear
To investigate the characteristics and formation mechanism of grinding-induced burns and cracks in 20CrMnTi steel gear, diverse distribution characteristics including metallographic structure, Microhardness, and residual stress of the gear surface were analyzed. Under the effect of thermal-mechanica...
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Published in | Materials and manufacturing processes Vol. 34; no. 10; pp. 1143 - 1150 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis
27.07.2019
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Subjects | |
Online Access | Get full text |
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Summary: | To investigate the characteristics and formation mechanism of grinding-induced burns and cracks in 20CrMnTi steel gear, diverse distribution characteristics including metallographic structure, Microhardness, and residual stress of the gear surface were analyzed. Under the effect of thermal-mechanical coupling, the transformation mode of metallographic structures led to different degrees of grinding burns, showing the unique nature of each affected layer. When subjected to tempering-induced burn, martensite was transformed into troostite or sorbite to thus decrease the microhardness and initial residual compressive stress. When being subjected to quenching-induced burn, the fine-grained white layer formed, and the surface microhardness was enhanced, but the residual compressive stress on the gear surface was transformed into tensile stress, resulting in the generation of grinding-induced cracks. By optimizing the grinding parameters and conducting shot peening strengthening treatment, grinding-induced burns or cracks can be prevented. |
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ISSN: | 1042-6914 1532-2475 |
DOI: | 10.1080/10426914.2019.1605173 |