含硅合金钢的热处理参数模拟

Parameters of Simulated of Heat Treatment of Alloy Steel Containing Silicon

对0.8Cr-2.2Mn-0.3Mo-1.0Si-0.004B-0.45C(1%Si钢)和0.8Cr-2.2Mn-0.3Mo-2.0Si-0.004B-0.45C(2%Si钢)两种含硅耐磨合金钢进行金相分析和硬度测试,利用材料性能JMatPro模拟软件,对含硅合金钢进行相转变和力学性能计算,得到了合金钢的平衡相组成、连续转变曲线(CCT)和淬透性曲线(Jominy)。结果表明,1%Si钢的奥氏体临界温度为AC3=754℃, AC1=695℃。2%Si钢的奥氏体化的临界转变温度为AC3=780℃, AC1=717℃。淬火冷却速度在1℃/s及以上时,合金钢的淬火组织和力学性能趋于稳定,主要以马氏体组织和残余奥氏体为主,其力学性能较佳。端淬性随距离淬火端面距离的增大,马氏体数量逐渐减少,屈服强度,抗拉强度和硬度明显递减。在距离淬火端面0~2 cm时减幅趋于平缓,在距离2~10 cm时减幅最大。

Metallographic analysis and hardness test were performed on two kinds of silicon-containing wear-resistant alloy steels,namely,0.8 cr-2.2 mn-0.3 mo-1.0 si-0.004 b-0.45 c(1%Si steel)and 0.8 cr-2.2 mn-0.3 mo-2.0 si-0.004 b-0.45 c(2%Si steel).Phase transformation and mechanical properties of silicon containing alloy steel were calculated by using JMatPro simulation software of materials properties,and the equilibrium phase composition,continuous transformation curve(CCT)and hardenability curve(Jominy)of alloy steel were obtained.The results show that the critical austenitic temperature of 1%Si steel is AC3=754℃and AC1=695℃.The critical transition temperature of austenitization of 2%Si steel is AC3=780℃and AC1=717℃.When quenching cooling rate is 1℃/s or above,the quenching structure and mechanical properties of alloy steel tend to be stable,mainly martensite structure and residual austenite,and its mechanical properties are better.The martensite quantity decreases with the increase of the distance from quenching end face,the yield strength,tensile strength and hardness decrease obviously.At 0~2 cm away from the quenching end,the reduction tends to be flat,and at 2~10 cm away from the maximum reduction.