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本文研究了W3Mo2Cr4VSi 钢中碳化物在固相中沉淀和溶解的规律以及硅对该过程的影响。实验表明:三种热处理状态(退火、淬火和回火)共有六种碳化物MC、M_6C、M_7C_3,M_(23)C_6,M_3C 和M_2C。其中560℃回火析出的碳化物主要是弥散细小的MC 型碳化物和沿孪晶界析出的M_3C 合金渗碳体。硅进入并稳定M_6C 碳化物,增加回火析出的特殊碳化物的数量,但显著抑制M_3C 在回火中的沉淀。文章讨论了W3Mo2Cr4VSi 钢在560℃回火时产生M_3C 碳化物的原因。
In this paper, the law of precipitation and dissolution of carbides in solid phase in W3Mo2Cr4VSi steel and the effect of silicon on the process were studied. Experiments show that there are six carbides MC, M_6C, M_7C_3, M_ (23) C_6, M_3C and M_2C in the three heat treatment conditions (annealing, quenching and tempering). Among them, the carbide precipitated at 560 ℃ is mainly composed of fine MC-type carbides and M_3C alloy cementite precipitated along the twin boundaries. Silicon enters and stabilizes M_6C carbides, increasing the amount of special carbides precipitated by tempering, but significantly inhibits the precipitation of M_3C during tempering. The article discusses the reason that W3Mo2Cr4VSi steel produces M_3C carbides when tempered at 560 ℃.