提出了一种Ni质量分数为7.7％的低C低温用CrNi钢,研究了其经淬火+两相区淬火+回火(QLT)处理后的力学性能,采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和电子背散射衍射(EBSD)对试验钢的显微组织演化规律进行了研究.结果表明:经QLT处理的试验钢的显微组织主要为铁素体(F)+板条马氏体(LM)+马氏体/奥氏体组元(M/A)+回转奥氏体(γ ').随着两相区热处理温度(tL)的升高,LM的比例逐渐增加,F的比例逐渐减少,晶粒细化,大角度晶界(HAGB)比例和平均晶界角度(AGBA)大幅增加.当tL在650～680℃时,γ '的体积分数约为7％.-196℃下韧性(KV2)主要取决于γ '含量和HAGB比例两个因素.经QLT处理,试验钢的屈服强度(Rp0.2)大于530 MPa,抗拉强度(Rm)大于670 MPa,-196℃下的冲击韧性大于150J,强韧性达到了当前9Ni钢的水平.
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