Thermal Stability of a New Ni-Fe-Cr Base Alloy with Different Ti/Al Ratios

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	Thermal Stability of a New Ni-Fe-Cr Base Alloy with Different Ti/Al Ratios
	C. S.; Wang Wang, T. T.; Tan, M. L.; Guo, Y. G.; Guo, J. T.; Zhou, L. Z.
	2015
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	31 期号:2 页码:135-142
摘要	Influence of Ti/Al ratios on the thermal stability of a new low cost Ni-Fe-Cr base wrought alloy, designed for application at 700 degrees C in advanced ultra-supercritical coal-fired power plants (700 degrees C A-USC), was investigated both experimentally and thermodynamically. After standard heat treatment, the alloys with different Ti/Al ratios had the same microstructural characteristics. However, compared with the alloys with high Ti/Al ratio, the low Ti/Al ratio can increase the gamma' -solvus temperature, decrease gamma' coarsening rate and reduce the temperature range of eta phase precipitation. For the alloys with low Ti/Al ratio, the yield strength has no obvious decrease during long-term thermal exposure at 700 and 750 degrees C, but after thermal exposure at 750 degrees C for 5000 h, the yield strength of the alloys with high Ti/Al ratio obviously decreases due to the eta phase precipitation. The influence of eta phase on mechanical properties is related with its size. When the eta phase is small, it has no obvious influence on mechanical properties, but eta phase becomes the crack initiation site with the further growth of eta phase. It can be concluded that the decrease in Ti/Al ratio can improve the thermal stability to meet the requirement of 700 degrees C A-USC coal-fired power plants.
部门归属	[wang, changshuai ; wang, tingting ; tan, meilin ; guo, yongan ; guo, jianting ; zhou, lanzhang] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; zhou, lz (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; lzz@imr.ac.cn
关键词	700 Degrees c A-usc Ni-fe-cr Base Alloy Thermal Stability Eta Phase Ti/al Ratio Nickel-based Superalloy Coal Power-plants Mechanical-properties Eta-phase Microstructure
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73942
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. S.,Wang Wang, T. T.,Tan, M. L.,et al. Thermal Stability of a New Ni-Fe-Cr Base Alloy with Different Ti/Al Ratios[J]. Journal of Materials Science & Technology,2015,31(2):135-142.
APA	C. S.,Wang Wang, T. T.,Tan, M. L.,Guo, Y. G.,Guo, J. T.,&Zhou, L. Z..(2015).Thermal Stability of a New Ni-Fe-Cr Base Alloy with Different Ti/Al Ratios.Journal of Materials Science & Technology,31(2),135-142.
MLA	C. S.,et al."Thermal Stability of a New Ni-Fe-Cr Base Alloy with Different Ti/Al Ratios".Journal of Materials Science & Technology 31.2(2015):135-142.