Effects of Nb and W Additions on the Microstructures and Mechanical Properties of Novel γ/γ' Co-V-Ti-Based Superalloys

被引：13

作者：

Liu, Xingjun ^{[1
,2
,3
]}

Pan, Yunwei ^{[1
,2
]}

Chen, Yuechao ^{[1
,2
]}

Han, Jiajia ^{[1
,2
]}

Yang, Shuiyuan ^{[1
,2
]}

Ruan, Jingjing ^{[1
,2
]}

Wang, Cuiping ^{[1
,2
]}

Yang, Yuansheng ^{[4
]}

Li, Yingju ^{[4
]}

机构：

[1] Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China

[2] Xiamen Univ, Fujian Prov Key Lab Mat Genome, Xiamen 361005, Peoples R China

[3] Harbin Inst Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

[4] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China

来源：

METALS | 2018年 / 8卷 / 07期

基金：

国家重点研发计划;

关键词：

Cobalt-based superalloys; gamma prime; microstructure evolution; high-temperature mechanical properties; AL-W; ALLOYING ELEMENTS; PHASE-EQUILIBRIA; LATTICE MISFIT; PLANAR DEFECTS; YIELD-STRESS; TEMPERATURE; DEFORMATION; CREEP; BEHAVIOR;

D O I：

10.3390/met8070563

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructures, elemental partition behavior, phase stabilities and mechanical properties of Nb- and W-containing Co-V-Ti-based superalloys were investigated. Elemental partition coefficients (K-X = C-gamma/C gamma) of Nb and W in Co-V-Ti-based superalloys are 2.07 and 1.10, respectively. The gamma' solvus temperatures are determined as 1023 degrees C, 1055 degrees C and 1035 degrees C in Co-12V-4Ti, Co-10V-4Ti-2Nb and Co-10V-4Ti-2W alloys, which are higher than those of Co-9Al-9W alloy (1000 degrees C). The mass densities of quaternary Co-10V-4Ti-2Nb and Co-10V-4Ti-2W alloys are about 8.31 and 8.50 g.cm(-3), respectively, which are 15% lower than Co-Al-W-based superalloys (9.8 g.cm(-3)). All examined alloys exhibit an anomalous positive dependence on temperature rising from 600 to 750 degrees C. Strengths of all examined alloys are higher than those of MarM509 (traditional Cobalt-based superalloy) and Co-9Al-9W at all temperatures that we investigated. The maximum flow stress of Co-V-Ti-Nb alloy is about 638 MPa at 750 degrees C while that of Co-V-Ti-W alloy is about 588 MPa at 700 degrees C.

引用

页数：12

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