Effect of Aging Time on Microstructure and Properties of Cold-Rolled Ni-W-Co-Ta Medium-Heavy Alloy

被引:0
作者
Li, Yong [1 ]
Xiong, Yi [2 ,3 ]
Li, Hua-fei [2 ]
Han, Shun [1 ]
Ren, Feng-zhang [2 ,3 ]
Wang, Chun-xu [1 ]
机构
[1] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
[2] Henan Univ Sci & Technol, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China
[3] Collaborat Innovat Ctr New Nonferrous Met Mat & Ad, Luoyang 471023, Peoples R China
关键词
cold-rolled Ni-W-Co-Ta medium-heavy alloy; aging time; microstructure; mechanical properties; MECHANICAL-PROPERTIES; IMPACT; PRECIPITATION; BEHAVIOR; TENSILE;
D O I
10.3390/coatings14020230
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A systematical exploration of the effect of aging time on the microstructure and mechanical properties of cold-rolled Ni-W-Co-Ta medium-heavy alloy with 90% thickness reduction at the aging temperature of 700 degrees C was performed. The results demonstrate that the volume fraction of the precipitation (Ni4W), which persists under various aging times, increases from 13.7% (2 h) to 28.7% (32 h) with the extension of aging time. Meanwhile, the microstructure after aging treatment is still dominated by dislocation entanglement and dislocation walls, although the degree of lattice distortion and dislocation density attributed to heavy deformation decreases. The maximum tensile strength, yield strength, and microhardness (2286 MPa, 1989 MPa, 766 HV) of the cold-rolled Ni-W-Co-Ta medium-heavy alloy under the 16 h aging treatment at 700 degrees C are reached, respectively. The ductile-brittle mixed fracture morphology is maintained in the fracture morphology of the medium-heavy alloy before and after aging treatment.
引用
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页数:12
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