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Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy
Alternative TitleEffect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy
Pei Zhongye1; Han Wei2; Zhao Gang2; Chen Xingfu2; Li Juntao2; Tian Yanwen1
2009
Source PublicationJOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
ISSN1006-706X
Volume16Issue:6Pages:70-74
AbstractK465 superalloy, as a material for production of turbine nozzle, shows high mechanical properties as well as microstructure stability under critical and severe service conditions. The appropriate microstructure and strength of this alloy can be obtained by solid solution strengthening mechanism. Heat treatment parameters such as time and temperature of homogenization, partial solution and aging temperatures, and cooling rate from solid solution temperature. affect the microstructure of the alloy. Among these parameters, cooling rate from solid solution temperature is the most effective. Therefore, the effect of cooling rate on microstructure and mechanical properties (tensile and stress properties) was investigated. For this purpose, three different cooling rates were applied to the cast K465 specimens subjected to solution treatment at 1 483 K for 4 h. Microstructures of the specimens then were studied using optical and electron microscopy. Also, tensile tests were performed at room temperature and stress rupture tests were performed under the condition of 1 248. K and 230 MPa. It was found that with increasing the cooling rate, the size of the gamma' precipitates decreases and the mechanical properties of specimens increases. Also, it was found that the shape and volume fraction of primary gamma' particles are largely influenced by the cooling rate after solution treatment at 1 483 K for 4 h.
Other AbstractK465 superalloy, as a material for production of turbine nozzle, shows high mechanical properties as well as microstructure stability under critical and severe service conditions. The appropriate microstructure and strength of this alloy can be obtained by solid solution strengthening mechanism. Heat treatment parameters such as time and temperature of homogenization, partial solution and aging temperatures, and cooling rate from solid solution temper-ature affect the microstructure of the alloy. Among these parameters, cooling rate from solid solution temperature is the most effective. Therefore, the effect of cooling rate on microstructure and mechanical properties (tensile and stress properties)was investigated. For this purpose, three different cooling rates were applied to the cast K465 specimens subjected to solution treatment at 1483 K for 4 h. Microstructures of the specimens then were studied u-sing optical and electron microscopy. Also, tensile tests were performed at room temperature and stress rupture tests were performed under the condition of 1248 K and 230 MPa. It was found that with increasing the cooling rate, the size of the γ' precipitates decreases and the mechanical properties of specimens increases. Also, it was found that the shape and volume fraction of primary γ' particles are largely influenced by the cooling rate after solution treatment at 1483 K for4 h.
KeywordNICKEL-BASE SUPERALLOY POWDER-METALLURGY SUPERALLOY HEAT-TREATMENT PRECIPITATION CREEP cast superalloy solution heat treatment cooling rate microstructure mechanical property
Indexed ByCSCD
Language英语
CSCD IDCSCD:3734641
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/145806
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.Cent Iron & Steel Res Institute, High Temp Mat Res Div, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Pei Zhongye,Han Wei,Zhao Gang,et al. Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy[J]. JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,2009,16(6):70-74.
APA Pei Zhongye,Han Wei,Zhao Gang,Chen Xingfu,Li Juntao,&Tian Yanwen.(2009).Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy.JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,16(6),70-74.
MLA Pei Zhongye,et al."Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy".JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 16.6(2009):70-74.
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