Superior mechanical properties of 40Cr steel obtained by quenching and microstress relieving under electropulsing

Superior mechanical properties of 40Cr steel obtained by quenching and microstress relieving under electropulsing
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电脉冲淬火和消除微应力获得 40Cr 钢的优异机械性能

DOI:
10.1016/j.msea.2019.138782
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发表时间:
2020-01
期刊:
Materials Science and Engineering: A
影响因子:
--
通讯作者:
W. Jiang
W. Jiang
中科院分区:
其他
文献类型:
--
作者:
P. Yin;H. Zang;Y. Zhao;C. Wu;X. Xu;D. Pan;W. Jiang

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40Cr钢经电脉冲淬火(EQ)+回火(ET)处理后,可同时获得高强度(屈服强度为1920 ± 17 MPa,抗拉强度为2241 ± 39 MPa)和良好的塑性(15.2 ± 1.1%)。结果表明,EQ有利于获得位错密度高、晶粒旋转度高的超细马氏体(<110>织构沿电流方向沿着分布,施密德因子大)。同时,电子转移不足以改变取向,但可以在不显著降低位错密度的情况下快速消除微观残余应力。与常规热处理相比,它为在短时间内提高钢的机械性能提供了一种有前途的方法。
High strength (the yield strength and ultimate tensile strength are 1920 ± 17 MPa and 2241 ± 39 MPa, respectively) and good ductility (15.2 ± 1.1%) are achieved simultaneously in 40Cr steel via electropulsing quenching (EQ) and tempering (ET). It was found that EQ contributes to ultra-fine martensite with high dislocation density and grain rotations (<110> texture distributed along the current direction and large Schmid factor). Meanwhile, ET is insufficient to modify the orientation, while it makes a rapid relief of micro residual stress without significantly decreasing the dislocation density. Compared to the conventional heat treatment, it provides a promising approach for enhancing the mechanical properties of steels in a short time.
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