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金属学报    DOI: 10.11900/0412.1961.2016.00379
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W对第三代镍基单晶高温合金组织稳定性的影响
王博,张军,潘雪娇,黄太文,刘林,傅恒志
西北工业大学凝固技术国家重点实验室
EFFECTS OF W ON MICROSTRUCTURAL STABILITY OF THE THIRD GENERATION Ni-BASED SINGLE CRYSTAL SUPERALLOYS
全文: PDF(1533 KB)  
摘要: 通过对3种不同W(6%-8%, 质量分数, 下同)含量的第三代镍基单晶高温合金铸态, 热处理态和热暴露后的组织观察和成分分析, 研究了W对元素偏析, 热处理组织及热暴露过程中组织演化的影响. 结果表明: W含量的提高对合金元素的铸态偏析, 完全热处理后的γ′相形貌, 尺寸和体积分数无明显影响. 在950 ℃热暴露过程中, W含量的提高抑制了γ′相的粗化, 但加速了γ′相的连接变形. 3种合金在热暴露过程中析出的TCP相主要为μ相和σ相, 且TCP相析出量随W含量的增加缓慢增大. 此外, 3种合金在1000 ℃热暴露时TCP相析出量最大, 在950 ℃热暴露时次之, 在1050 ℃热暴露时析出量最小.
关键词 镍基单晶高温合金组织稳定性Wγ′相TCP相    
Abstract:Ni-based single crystal superalloys are widely used in the manufacture of aero engines turbine blades because of the excellent mechanical properties at high temperature. With the development of single crystal superalloys, the content of refractory elements is constantly increased (especially Re) to improve the high temperature capability, but which leads to alloys precipitate TCP phase and decrease microstructural stability of alloys. Therefore, it is important to find another element which can not only maintain high temperature performance but also does not promote TCP phase precipitation and is very cheap in price to replace part of Re. As well as Re, W is one of the most important solution strengthening elements in superalloys, its diffusion rate in Ni matrix is close to Re and far below the other alloying elements, meanwhile, the advantage of low price make it to be the most suitable substitute of Re. However, there is little work about the effect of W on microstructural stability in Re contained third generation superalloys. Therefore, in present work, the effects of W on segregation, microstructure after full heat treatment and microstructure evolution during thermal exposure have been investigated in three third generation Ni-based single crystal superalloys with varied contents of W (6%-8%, mass fraction). The results show that the addition of W has no obvious effect on alloy elements segregation of as-cast alloys as well as the morphology, size and volume fraction of γ′ phase after full heat treatment. During the thermal exposure at 950 ℃, the increase of W content promotes the connection and deformation of γ′ phase while decreases its coarsening rate. The TCP phases precipitated in three alloys during thermal exposure are mainly μ phase and σ phase. Besides, the area fraction of TCP phase is increased slightly with W addition during thermal exposure, and it is the largest at 1000 ℃, less at 950 ℃ and least at 1050 ℃.
Key wordsNi-based single crystal superalloy    microstructural stability    W    γ&prime    phase    TCP phase
收稿日期: 2016-08-22      出版日期: 2016-12-15
基金资助:国家高技术研究发展计划;国家自然科学基金重点项目;国家自然科学基金重点项目;陕西省自然科学基金
通讯作者: 王博   

引用本文:

王博 张军 潘雪娇 黄太文 刘林 傅恒志. W对第三代镍基单晶高温合金组织稳定性的影响[J]. 金属学报, 10.11900/0412.1961.2016.00379.

链接本文:

http://www.ams.org.cn/CN/Y0/V/I/0

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