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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 precipitated phases in Ni-based HR100 alloy aged at 700 ℃ for different time were qualitatively and quantitatively analyzed, and the precipitation behavior of carbides in HR100 alloy during long-term aging was studied. The results show that the M_6C carbides in the HR100 alloy are metastable phases. During the aging process, with the diffusion of alloying elements, M_6C in HR100 alloy gradually transformed into M_ (12) C. The precipitation behavior of carbides in HR100 alloy is mainly divided into three stages during the aging of 70000 ℃ for 10,000 h: rapid precipitation and transformation stage of M_6C → M_ (12) C, while the phases of M_ (12) C and M23C6 Further precipitation, growing stage. In addition, the changes of alloying elements in different types of carbides during the long-term aging process were analyzed. It was found that Cr and Mo played a major role in the (M_6C + M_ (12) C) roughening process. The Cr element played a major role in the coarsening of M_ (23) C_6.