摘要
通过SEM、TEM、XRD、化学相分析等方法对比研究新型扭杆弹簧用40Si2Ni2CrMoV钢(代号N1)和现有45CrNiMoVA钢微观组织及其力学性能,并利用升温脱氢分析(TDS)及慢应变速率拉伸(SSRT)方法对比研究两种试验钢的氢脆敏感性。结果表明,N1钢经300℃回火和45CrNiMoVA钢经180℃回火抗拉强度都在2000 MPa以上;N1钢和45CrNiMoVA钢的氢扩散系数分别为1.34×10^(-7)cm^2/s和2.07×10^(-7)cm^2/s;N1钢中氢扩散系数低于45CrNiMoVA钢,且经相同条件电化学充氢后,N1钢中充入的氢含量低于45CrNiMoVA钢,是N1钢的氢脆敏感性明显低于45CrNiMoVA钢的原因。
Microstructure and mechanical properties of a new developed 40Si2Ni2CrMoV steel（code name N1） and the commonly-used45 CrNiMoVA steel were investigated by means of SEM,TEM,XRD and chemical phase analysis,and the hydrogen embrittlement susceptibility of the steels was also evaluated by means of TDS and slow strain rate tensile（SSRT） test.The results show that the tensile strength of the N1 steel after tempering at 300 ℃ and 45 CrNiMoVA steel after tempering at 180 ℃ is above 2000 MPa.The hydrogen diffusion coefficients of the N1 steel and 45 CrNiMoVA steel are 1.34×10（-7）cm2/s and 2.07×10（-7）cm2/s,respectively.The hydrogen embrittlement susceptibility of the N1 steel is significantly lower than that of 45 CrNiMoVA steel because of its lower hydrogen diffusion coefficients and lower hydrogen content at the same hydrogen charging condition.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第8期76-82,共7页
Transactions of Materials and Heat Treatment
基金
国家重点研发计划(2016YFB0300104)
关键词
高强度钢
低温回火
氢脆
慢应变速率拉伸
氢扩散系数
high strength steel
low temperature tempering
hydrogen embrittlement
slow strain rate tensile test
hydrogen diffusion coefficients
