Analysis of surface cracking on 40CrNiMoA steel step shaft
LI Xuefeng 1,2,WANG Gang 3,PAN Hengpei 1,WANG Shining 1
1. Luoyang Ship Material Research Institute， Luoyang 471023， China；2. Henan Key Laboratory of Technology
and Application of Structural Materials for Ships and Marine Equipments， Luoyang 471023， China；
3. Luoyang Sunrui Wanji Titanium Industry Co., Ltd., Luoyang 471000, China
Abstract：Cracks were found on the surface of 40CrNiMoA steel step shaft during further machining after quenching and tempering. The causes of surface cracking were analyzed by means of macroscopic analysis, chemical composition analysis, metallographic observation, and fracture morphology observation. The results showed that the microstructure of the step shaft was coarse. The fracture had intergranular morphology. The cracks of the step shaft belonged to quenching cracking. The high quenching temperature and excessive quenching stress were the main reasons for the cracking of the step shaft.
收稿日期: 2021-09-28
引用本文:
李雪峰，王刚，潘恒沛，王世宁. 40CrNiMoA钢台阶轴表面裂纹产生原因分析[J]. 物理测试, 2021, 39(6): 33-.
LI Xuefeng, WANG Gang, PAN Hengpei, WANG Shining. Analysis of surface cracking on 40CrNiMoA steel step shaft. PHYSICS EXAMINATION AND TESTING, 2021, 39(6): 33-.
2021, Vol. 39 
