Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第13卷    第3期    总第54期    2003年6月

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文章编号:1004-0609(2003)03-0565-05
Ni-Cr-Co基高温合金704℃和
760℃时效组织稳定性
赵双群1,2, 董建新1, 谢锡善1  

(1. 北京科技大学 高温合金研究室, 北京 100083;
2. 宁夏大学 物理系, 银川 750021
)

摘 要: 利用热力学计算、 SEM、 TEM和相分析研究了一种新型Ni-Cr-Co基高温合金在704℃和760℃长期时效至2000h后的组织变化。 结果表明: 该合金标准热处理态和在704℃长期时效后的析出相有MC, M23C6, M6C和γ′, 在760℃长期时效后还析出了η相。 随时效时间增加, γ′(+η)及碳化物MC, M23C6和M6C的含量变化很小, 化学组成稳定,但γ′相粗化明显。 该合金在760℃时效时, η相的析出随时效时间的增加而加剧, 并且呈魏氏体分布。新合金在704℃长期时效时具有良好的组织稳定性,但在760℃时效时组织稳定性较差。 

 

关键词: Ni-Cr-Co基高温合金; 热力学计算; 组织稳定性; 析出相

Structure stability of Ni-Cr-Co base superalloy aged at 704℃ and 760℃
ZHAO Shuang-qun1,2, DONG Jian-xin1, XIE Xi-shan1

1. High Temperature Materials Research Laboratory,
University of Science and Technology Beijing,Beijing 100083, China; 
2. Department of Physics, Ningxia University,Yinchuan 750021, China

Abstract:Thermodynamic calculation, SEM, TEM, XRD, phase extraction and chemical analysis were employed to study the structure stability of a new Ni-Cr-Co base superalloy aged at 704℃ and 760℃ for long time. The results show that the precipitates of alloy standard heat-treated and heat-treated at 704℃ and 760℃ for time up to 2000h are γ′, MC, M23C6 and M6C, and η phases are also formed at grain boundaries and in the matrix of sample heat-treated at 760℃ as well. With increase in aging time, the mass fractions of γ′(+η), MC, M23C6 and M6C in all samples have no large changes and their chemical compositions are stable at the same temperature, but the γ′ precipitates grow obviously. The γ′-to-η transformation in sample heat-treated at 760℃ takes place with prolonged aging time. Theη precipitates form a Widmansttten pattern in samples heat-treated at 760℃. The new alloy maintains a better structure stability during prolonged aging at 704℃, but a worse structure stability during prolonged aging at 760℃.

 

Key words: Ni-Cr-Co base superalloy; thermodynamic calculation; structure stability; preci

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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