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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。
The microstructures and mechanical properties of 40Si2Ni2CrMoV steel (code N1) and the existing 45CrNiMoVA steel for torsion bar spring were compared by SEM, TEM, XRD and chemical phase analysis. The thermal deformation and dehydrogenation (TDS) and slow strain rate Stretching (SSRT) method to compare the hydrogen embrittlement susceptibility of two kinds of test steel. The results show that the tensile strength of N1 steel after tempering at 300 ℃ and the tempering of 45CrNiMoVA steel at 180 ℃ are both above 2000 MPa. The hydrogen diffusion coefficients of N1 steel and 45CrNiMoVA steel are 1.34 × 10 -7 cm -2 / s and 2.07 × 10 ~ (-7) cm ~ 2 / s respectively; the diffusion coefficient of hydrogen in N1 steel is lower than that of 45CrNiMoVA steel, and the content of hydrogen charged in N1 steel is lower than that of 45CrNiMoVA steel after electrochemical charging under the same conditions, Is N1 steel hydrogen embrittlement sensitivity was significantly lower than 45CrNiMoVA steel reasons.