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利用热/力学模拟试验机,对40Cr钢进行了变形温度为950、760、710℃,应变速率为0.1、0.5、10、30 s-1,应变量为0.7的热模拟单向单道次压缩试验。分析了试样热变形后的最大直径、横向最大真应变以及变形过程中的最大应力。结果表明,随着变形温度的降低,应变真应力明显上升,试样变形不均匀程度略有增加;40Cr钢在应变速率为10 s-1及以上时,试样变形不均匀程度明显,且不均匀程度随应变速率的增加而增大。
The 40Cr steel was subjected to thermal simulation of unidirectional one-pass compression at a strain rate of 0.1, 0.5, 10, 30 s-1 and strain of 0.7 at a deformation temperature of 950, 760 and 710 ° C using a thermal / mechanical simulator test. The maximum diameter, the maximum true strain in transverse direction and the maximum stress during deformation are analyzed. The results show that with the decrease of deformation temperature, the true stress of strain increases obviously, and the degree of non-uniform deformation of specimen increases slightly. When the strain rate is 10 s-1 and above, the deformation of 40Cr steel is not obvious, The degree of uniformity increases with strain rate.