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金属学报    DOI: 10.11900/0412.1961.2015.00358
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一种抗热腐蚀铸造镍基高温合金中σ相的析出及回溶
侯介山1,郭建亭2,袁超2,周兰章2
1. 中科院金属所
2. 中国科学院金属研究所
STUDY ON THE PRECIPITATION AND DISSOLUTION OF SIGMA PHASE IN A HOT CORROSION RESISTANCE CAST NICKLE BASED SUPERALLOY
Jian-Ting GUOChao YUAN2, 2
 
全文: PDF(2714 KB)  
  
摘要: 对合金长期时效过程中析出σ相的析出规律和机制进行了综述,研究了不同热处理条件下σ相的回溶规律及其对合金持久性能的影响.研究发现,在800-900℃范围内经过最长到1×104h时效后,合金中产生的σ相率先在枝晶干的M23C6碳化物附近形成,之后扩展到枝晶间;随着时效温度的升高,σ相形成速度加快,σ相形核的孕育时间缩短.激活能计算结果对比表明,σ相形成初期与Co、Cr的扩散相关,稳态阶段与Mo的扩散相关;长期时效后合金在1000-1170℃固溶时,σ相都可以回溶到基体,且固溶温度越高,σ相回溶越快.σ相的回溶动力学研究表明,σ相的回溶速度受Co的扩散过程控制.对比持久实验结果表明,合金中的σ相并不能使合金变脆;经过恢复热处理,长期时效过程中析出的σ相回溶,持久寿命提高.
关键词 镍基合金长期时效沉淀固溶sigma相    
Abstract:The experimental alloy is designed and employed in high-performance industrial gas turbines as low-pressure turbine blades, working in temperature range of 750 - 900 °C, The alloy contains high levels of refractory elements in order to increase the high-temperature mechanical properties, however, this can make the alloy prone to the formation of σ phase during service, which could deteriorate the properties further if the fraction of σ phase exceeds the safety allowances. In this study, the formation of sigma phase (σ) during long-term thermal exposure, dissolution of the sigma phase during rejuvenation process, and their influence on stress-rupture properties of a hot-corrosion resistant nickel based superalloy have been investigated.During long-term thermal exposure at 800-900 °C for up to 1×104 hours, the σ phase formation is mainly in dendrite cores with a few at interdendritic regions. As the aging temperature increases, formation rate of σ increases and the incubation time for σ nucleation decreases. From the kinetic analysis, the σ phases form firstly in the vicinity or on the M23C6 that locate in dendrite cores, with the strong segregation of W, Cr and Co contributing to this process. The calculated activation energies of σ formation show that the early stage is related to Co and Cr diffusion and the steady stage is related to Mo diffusion. During solid solution process at 1000-1170℃, the σ phases that precipitated during long-term thermal exposure dissolves to γ matrix. The higher the solid solution temperature is, the fast the sigma phase dissolves. Moreover, the sigma phase does not embrittle the alloy. The reheat treatment of the alloy leads to the dissolution of precipitated sigma phases and further prolongs the stress-rupture life efficiently.
收稿日期: 2015-07-07     
ZTFLH:     
通讯作者: 侯介山   

引用本文:

侯介山 郭建亭 袁超 周兰章. 一种抗热腐蚀铸造镍基高温合金中σ相的析出及回溶[J]. 金属学报, 10.11900/0412.1961.2015.00358.
Jian-Ting GUO Chao YUAN. STUDY ON THE PRECIPITATION AND DISSOLUTION OF SIGMA PHASE IN A HOT CORROSION RESISTANCE CAST NICKLE BASED SUPERALLOY. Acta Metall Sin, 0, (): 0-0.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00358      或      https://www.ams.org.cn/CN/Y0/V/I/0

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