低碳Si-Mn系TRIP钢中残余奥氏体量对性能的影响

Effect of Residual Austenite in Low Carbon Si-Mn TRIP Steel on Its Property

研究了低碳Si-Mn系TRIP钢中残余奥氏体量对性能的影响。实验钢经810℃加热保温50 min,在380℃的盐浴炉中分别等温10、20、40、60和120 min,等温后油冷至室温。通过X衍射分析,残余奥氏体的体积分数在等温20 min时达到最大值,为14.9%,而后又随等温时间的延长逐渐减少,在等温120 min时达到最小值,为9.9%。热处理使奥氏体中的碳元素富集,稳定了残余奥氏体,残余奥氏体体积分数越高,材料的综合性能越好。

The effect of residual austenite in low carbon Si-Mn TRIP steel on its property was researched.The samples were obtained after austenization at 810 ℃for 50 min followed by isothermal quenching at 380 ℃ for 10 min,20 min,40 min,60 min and 120 min respectively.Using X-diffraction analysis,the content of residual austenite is maximum（14.9%） when holding for 20min.And then,the content of residual austenite decreases with the extending of holding time.It reaches minimum（9.9%） when holding for 120 min.The residual austenite is firmed by heat treatment,which makes carbon rich.The higher the content of residual austenite,the better the comprehensive properties of the material.