研究了拉伸与压缩之间的175℃时效对双相钢中的Bauschinger效应和矫顽力的影响。结果表明:拉伸后时效可以使随后压缩时双相钢的屈服强度提高到拉伸预流变应力的水平,并出现上、下屈服点,使原来的Bauschinger效应消除。但175℃时效并不改变矫顽力随拉伸和压缩的变化,亦即不改变预应变引人的背应力。文中提出了背应力的测定方法,并对实验结果在双相钢实际应用中的意义进行了讨论。
The influence of aging at 175℃ between tension and compression upon the Bauschinger effect and variation of coercivity of dual phase steels has been investigated. The results show that the aging after tension may increase the yield strength of dual phase steel in reversal compression to the value of flow stress for strain in the original tension and occur the Lüders strain as well as dispel the prior Bauschinger effect. But it does not change the variation of coercivity with tension and compression. This implies that the aging at 175℃ after tension does not change the value of the back stress due to original tension. A measuring method of back stress was suggested and the practical importance of mentioned results has been discussed.
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