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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40Si2Ni2Cr Mo V钢(代号N1)和现有45Cr Ni Mo VA钢微观组织及其对力学性能的影响,并利用慢应变速率拉伸方法对比研究两种不同扭杆弹簧用钢的氢脆敏感性。结果发现,N1钢由于添加硅、钼等抗回火软化元素,使得N1钢在较高的300℃温度回火时还能保持一定的抗拉强度,N1钢有大量细小的ε-碳化物析出,使得屈服强度增加,屈强比在0.80以上,45Cr Ni Mo VA钢经180℃低温回火后屈服强度在1 550 MPa左右,屈强比只有0.72;经相同条件充氢后,N1钢的慢拉伸强度下降幅度较小,其试样断口中也没有观察到沿晶断裂特征,N1钢的氢脆敏感性明显低于45Cr Ni Mo VA钢。
The microstructures of 40Si2Ni2Cr Mo V steel (code N1) and the existing 45Cr Ni Mo VA steel for torsion bar spring were compared with each other by SEM, TEM, XRD and chemical phase analysis. The effects of slow strain rate Tensile Methods Comparative study of two different torsion bar spring steel hydrogen embrittlement sensitivity. The results show that the addition of anti-temper softening elements, such as silicon and molybdenum, makes the N1 steel maintain a certain tensile strength when it is tempered at a high temperature of 300 ° C. The N1 steel has a large number of fine ε-carbides precipitated , The yield strength is increased, the yield ratio is above 0.80. The yield strength of 45Cr Ni Mo VA steel after tempering at 180 ℃ is about 1 550 MPa, and the yield ratio is only 0.72. Under the same conditions, the slowing down of N1 steel The decrease of tensile strength was small, and no intergranular fracture was observed in the fracture of the specimen. The hydrogen embrittlement sensitivity of N1 steel was obviously lower than that of 45Cr Ni Mo VA steel.