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| Effect of deformation on microstructure and residual stress of 18CrNiMo7-6 carburizing steel |
| WANG Gang1,2, LI Junhao1,2, SANG Xianggang1,2, ZHANG Yue1,2, LI Hao1,2 |
1. School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China;
2. Henan Key Engineering Laboratory for Anti-fatigue Manufacturing Technology, Zhengzhou University, Zhengzhou 450001, Henan, China |
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Abstract In order to grasp the deformation behavior of 18CrNiMo7-6 carburizing steel under load,improve material performance,and ensure the reliability and service safety of key components. Axial compression and tensile deformation tests are carried out,the crystal orientation and microscopic interface changes of the deformed sample are analyzed,and the surface residual stress of sample is measured to study the influence mechanism of the microstructure change on the residual stress during the deformation process,and to understand the microstructure,residual stress value and distribution of 18CrNiMo7-6 carburizing steel after deformation. The test results show that during the deformation process,with the increase of applied load,dislocation movement occurs in the carburized layer region of sample,resulting in an increase in the Kernel Average Misorientation and dislocation density,grain refinement,and the proportion of low-angle grain boundaries; the orientation of martensite in the slip system{111}〈110〉 is mainly soft orientation,which is prone to slip. During the quenching process of 18CrNiMo7-6 carburizing steel,due to the transformation from austenite to martensite,an inhomogeneous residual compressive stress field is generated in the carburized layer area. The overall distribution trend of residual compressive stress along the depth direction is gradually increasing first,then gradually decreasing,reaching the maximum value (-224.65 MPa) at a depth of about 900 μm from the surface. The axial deformation has no effect on the overall distribution trend of residual stress along the depth direction. When the sample deformation is -0.25%,-0.50% and -0.75%,the surface axial residual stress relaxes by 3.3%,4.9% and 18.9% respectively. When the deformation is 0.25%,0.50% and 0.75%,the surface axial residual stress relaxes by 1.3%,14% and 27%,respectively. The research results show that when the vector sum of applied stress and residual stress exceeds the local elastic limit of material surface,local plastic deformation will occur,which will cause the change of dislocation density,and then lead to the relaxation of residual stress. The larger the amount of plastic deformation,the more obvious the residual stress relaxation.
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Received: 27 March 2023
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2023, Vol. 58 
