Influence of Rhenium on the Mechanical Behavior and Fracture Mechanism of a Fine-Grain Superalloy at Elevated Temperatures

被引:11
作者
Liao, Jian-Hong [1 ]
Bor, Hui-Yun [2 ]
Chao, Chuen-Guang [1 ]
Liu, Tzeng-Feng [1 ]
机构
[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30049, Taiwan
[2] Chung Shan Inst Sci & Technol, Mat & Electroopt Res Div, Tao Yuan 32599, Taiwan
关键词
superalloy; rhenium; tensile; creep; fracture; MAR-M247; SUPERALLOY; CREEP-PROPERTIES; BASE SUPERALLOY; MICROSTRUCTURES; ADDITIONS; MG;
D O I
10.2320/matertrans.M2010299
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study investigated the influence of rhenium on the mechanical behavior and fracture mechanism of a fine-grain Mar-M247 superalloy at elevated temperatures. Tensile test results showed that the addition of 3 mass% Re significantly improved the ultimate tensile strength and yield strength from room temperature to 760 degrees C. Creep test results showed that steady-state creep behavior dominated creep properties under the test condition of 760 degrees C/724 MPa. The steady-state creep rate and creep life of alloy with 3 mass% Re was reduced by 31% and prolonged by 63%, respectively, compared to alloy without Re. The improvement in tensile and creep properties in 3 mass% Re alloy was associated with a decrease in grain and gamma' size and an increase in strength of gamma/gamma' matrix. However, adding 4.5 mass% Re resulted in a decrease in the tensile and creep properties due to the formation of needle-like P phase in the grain interior. Fracture analysis demonstrated that during tensile and creep tests, cracks initiated and propagated along grain boundary in alloy without Re and containing 3 mass% Re alloy; however, in the alloy containing 4.5 mass% Re, cracks initiated and propagated along grain boundary and the P phase/matrix interface. Under the current tensile and creep conditions, 3 mass% Re was an optimal addition for casting a fine-grain Mar-M247 superalloy. [doi: 10.2320/matertrans.M2010299]
引用
收藏
页码:201 / 209
页数:9
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