摘要
以高钴铬钼镍轴承齿轮钢为实验材料,通过TDS测试、慢应变速率拉伸、微观分析等实验方法系统研究了实验钢的氢致断裂过程。结果表明,充氢导致实验钢强塑性明显下降,钢中的氢大部分为可扩散氢,由较弱的氢陷阱控制。通过对比2种实验钢的晶粒尺寸、板条尺寸、残余奥氏体数量、位错密度、析出相等,分析得到对实验钢抗氢脆性能的主要影响因素为碳化物密度和分布,弥散分布的细小碳化物更有利于提高抗氢脆性能。实验得出韧脆临界充氢条件,推断出临界氢含量,为部件的高可靠性安全服役提供了参考。
High Co-Cr-Mo-Ni bearing gear steel was used as the test material,and hydrogen induced fracture process of the test steel was studied by TDS test,slow strain rate drawing and micro analysis.The results show that the high plasticity of the test steel is obviously decreased.Most of the hydrogen in the test steel is diffusible hydrogen,which is controlled by the weaker hydrogen trap.By comparing the grain size,the size of the strip,the number of residues,the dislocation density and the precipitation of the two kinds of test steels,the main influencing factors of the anti-hydrogen brittleness of test steel are the carbon density and distribution,and dispersed fine carbides are more conducive to improve hydrogen embrittlement resistance.The critical hydrogen concentration is obtained and the critical hydrogen concentration is deduced,which provides a reference for the high reliability and safe service of the components.
作者
罗志强
杨卯生
李建新
严晓红
LUO Zhi-qiang;YANG Mao-sheng;LI Jian-xin;YAN Xiao-hong(Central Laboratory Department,Central Iron and Steel Research Institute,Beijing 100083,China;Special Steel Institute,Central Iron and Steel Research Institute,Beijing 100083,China;Technology Center Departement,Fushun Special Steel Co.,Ltd.,Fushun 113000,Liaoning,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2018年第8期666-673,共8页
Journal of Iron and Steel Research
关键词
高钴铬钼镍轴承齿轮钢
氢脆
慢速拉伸
氢陷阱
抗氢脆性能
high Co-Cr-Mo-Ni hearing gear steel
hydrogen embrittlement
slow strain rate tensile
hydrogen trap
resistance to hydrogen embrittlement
