固溶处理对316不锈钢晶粒长大和硬度的影响

Influence of solution treatment on grain growth and hardness for 316 stainless steel

通过金相显微仪、电子背散射衍射和硬度计测量等手段,研究了1100~1175℃条件下固溶处理对316不锈钢的微观组织、晶界分布特征以及合金硬度的影响。同时,建立了Anelli晶粒长大模型。研究结果表明:随着固溶温度的增大和保温时间的延长,不锈钢的晶粒尺寸逐渐长大。当固溶温度超过1150℃、保温时间超过60 min时,晶粒尺寸增长迅速。基于晶界的重位点阵理论对晶界分布特征进行分析,结果表明,随着固溶温度的增大和保温时间延长,∑3、∑9和∑27晶界含量均下降,尤其∑3晶界含量下降明显,并且试样硬度也随之降低。固溶温度对晶粒尺寸和硬度的影响明显大于保温时间的作用。

The influences of solution treatment at 1100-1175℃.on the microstructure,grain boundary distribution characteristics and alloy hardness of 316 stainless steel were studied by means of metallographic microscopy,EBSD and microhardness tester.At the same time,the Anelli grain growth model was established.The results show that the grain size of stainless steel gradually grows with the increasing of solution temperature and the extension of holding time,when the solution temperature exceeds 1150℃and the holding time exceeds 60 min,the grain size increases rapidly.Based on the concidence site lattice theory of grain boundaries,the distribution characteristics of grain boundaries were analyzed and found.With the increasing of solution temperature and the extension of holding time,the contents of ∑3,∑9,and ∑27 grain boundaries all decrease,especially the grain boundary content of ∑3 decreases obviously,and the hardness of sample also decreases.The effect of solution temperature on the grain size and hardness is significantly greater than that of holding time.