摘要
为了进一步提升25CrMo4车轴钢的综合性能,先进行5道次轧制后再进行退火热处理,通过慢应变速率拉伸(SSRT)方法测试了氢脆性能。通过实验测试分析退火时间对冷轧25CrMo4车轴钢织构及氢脆断裂的影响。研究结果表明,在轧制下奥氏体转化为马氏体,形成大量位错。随退火时间的延长,大部分碳化物已经溶解,衍射峰值强度逐渐提高,促进逆相转变奥氏体的生成。试样在没有充氢的情况下,断口形貌形成明显裂纹缺陷和实心韧窝,随着退火时间的延长形成了更大韧窝,提升氢脆敏感性。该研究有助于提高车轴钢的内部冶金性能,为后续的工艺优化奠定一定的理论基础。
In order to further improve the comprehensive properties of 25CrMo4 axle steel,the hydrogen embrittleness energy was tested by slow strain rate drawing(SSRT)method after 5 rounds of rolling and annealing.The effect of annealing time on the texture and hydrogen embrittlement fracture of cold-rolled 25CrMo4 axle steel was studied by means of experiment.The results show that austenite is transformed into martensite and a large number of dislocations are formed under rolling.With the extension of annealing time,most of the carbides are dissolved and the peak diffraction intensity increases gradually,which promotes the formation of reverse phase transition austenite.The fracture morphology of the sample without hydrogen filling formed obvious crack defects and solid dimples,and larger dimples were formed with the extension of hot annealing time,which improved the hydrogen embrittlement sensitivity.The research is helpful to improve the internal metallurgical properties of axle steel and laysa theoretical foundation for the subsequent process optimization.
作者
郭杏莉
Guo Xingli(School of Automotive Engineering,Henan Vocational College of Industry and Trade,Zhengzhou Henan 450000,China)
出处
《山西冶金》
2025年第7期53-54,57,共3页
Shanxi Metallurgy
关键词
车轴钢
冷轧
退火热处理
氢脆敏感性
微观组织
axle steel
cold rolling
annealing heat treatment
hydrogen embrittlement sensitivity
microstructure
