12Cr-F/M钢的固溶工艺及热变形行为

Solution treatment process and hot deformation behavior of 12Cr-F/M steel

研究了12Cr-F/M钢在不同固溶处理工艺(加热温度1100~1200℃、保温时间1~2 h)下的微观组织演变规律,并采用热模拟压缩试验研究了其在变形温度为800~1000℃、应变速率为0.01~10 s^(-1)工艺条件下的热变形行为。结果表明:随固溶温度升高,12Cr-F/M钢中铁素体晶粒尺寸先减小后增大,随保温时间延长,铁素体晶粒均长大粗化;经固溶处理后基体中部分低熔点的Laves析出相发生分解,并固溶在合金基体中,总数量逐渐减少。1150℃×1 h固溶处理后,12Cr-F/M钢基体中铁素体晶粒尺寸较小的同时,Laves析出相数量较少。12Cr-F/M钢高温变形流变应力随温度的升高而降低,随应变速率的升高而增大。

Microstructure evolution of 12Cr-F/M steel under different heat treatment processes(heating at 1100-1200℃and holding for 1-2 h)was studied,and hot deformation behavior of the steel under deformation temperature of 800-1000℃and strain rate of 0.01-10 s^(-1)was also studied by using thermal simulation compression tests.The results show that as the solution treatment temperature increases,the ferrite grain size in the 12Cr-F/M steel first decreases and then increases.With the prolongation of holding time,the ferrite grains all grow and coarsen.After the solution treatment,some low melting point Laves precipitates in the matrix decompose and dissolve in the matrix,and the total amount gradually reducing.After solution treated at 1150 for 1 h,the ferrite grain size in the steel matrix is smaller,while the amount of Laves precipitates is less.The flow stress of the 12Cr-F/M steel during high-temperature deformation decreases with increase of the temperature,and increases with increase of the strain rate.