700℃时效过程中HR100合金的碳化物析出行为

Precipitated behavior of carbides in HR100 alloy during long-term aging process at 700℃

对经700℃时效不同时间后的镍基HR100合金中的析出相进行了定性与定量分析,研究了HR100合金中的碳化物在长期时效过程中的析出行为。结果表明,HR100合金中的M_6C型碳化物为亚稳相。在长期时效过程中,随着合金元素的扩散,HR100合金中的M_6C会逐渐转化为M_(12)C。而且在700℃时效1万h过程中,HR100合金中的碳化物的析出行为主要分3个阶段:快速析出与M_6C→M_(12)C转化阶段,相对稳定阶段,M_(12)C和M23C6进一步析出、长大阶段。另外,对不同类型碳化物中的合金元素配比在长期时效过程中的变化进行了分析,发现在(M_6C+M_(12)C)的粗化过程中,Cr元素和Mo元素起主要作用;而在M_(23)C_6的粗化过程中,Cr元素起主要作用。

The qualitative and quantitative analysis of precipitation phases in the nickel-based HR100 alloy after long-term ageing at 700℃for different time was carried out.The precipitation behavior of carbides in HR100 alloy during the process of long-term aging was studied.The result shows that the M6C type carbide is the metastable phase in HR100 alloy.In the long-term aging process,the M6C would gradually transform to M12C as the alloy element spreads in HR100 alloy.And in the process of long-term ageing at 700℃for 104 hours,the precipitation behavior of carbides mainly includes three stages in HR100 alloy：rapid precipitation and M6C → M12C transformation stage,a relatively stable stage,and further precipitation and growing-up of M12C and M23C6.In addition,the changes of alloy elements in different types of carbides during the long-term aging process were analyzed.It is found that the Cr and Mo elements play major roles in the coarsening process of（M6C＋ M12C）.When it comes to M23C6,only the Cr element plays a major role.