Effect of Prestrain and Tempering on the Residual Stress of Low‐Carbon Microalloyed Steel

Ding, Wen Hong; Liu, Yazheng; Xie, Jun; Sun, Laixi; Liu, Tianwu; Yuan, Fang; Jin, Peng

doi:10.1002/srin.202070021

Cited by 1 publication

(1 citation statement)

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“…Zheng et al [8,9] studied the effect of prestrain and the loading aging on the microstructure evolution of 7075 aluminum alloy, and found that prestrain can inhibit the coarsening of carbide and enhance the relaxation effect of residual stress. The influence of the prestrain on the precipitation behavior of the second phase in the tempering process is also confirmed by other researchers [10,12] Therefore, the PST process is an important means to regulate the precipitation behavior of carbides during tempering [3,13]. To the best of our knowledge, the studies of microstructure evolution in the tempering process using PST methods mainly concentrate on aluminum alloys, while the studies involving high strength steel have not been reported.…”

Section: Introductionsupporting

confidence: 62%

Evolution of Carbides during Prestrain and Tempering

Ding

Jiang

Zhang

et al. 2021

MSF

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The effect of thermo-mechanical treatment on the microstructural evolution of low carbon micro-alloyed high strength steel was studied by combining prestrain with tempering (PST) in this paper. It was found that the prestrain causes the dislocation to plug up around the grain boundary and carbide, resulting in carbide boundary fragmentation. Moreover, it breaks the thermo-dynamic equilibrium between the matrix and carbide, induces the dissolution of carbon in the high energy state, and then changes the distribution of carbon in the matrix. In the subsequent tempering process, the precipitation regularity of carbide was changed, which promoted the precipitation carbide at low temperature. The influence of carbide precipitation on dislocation can be divided into two stages: the first stage was precipitation induced creep, which promoted stress relaxation; the second stage was precipitation pinning dislocation, which improved material strength and inhibited stress relaxation.

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