Comparative analysis of cold and warm rolling on tensile properties and microstructure of additive manufactured Inconel 718

被引:11
作者
Zhang, Tao [1 ,2 ]
Li, Huigui [1 ,2 ]
Gong, Hai [1 ,2 ]
Wu, Yunxin [1 ,2 ]
Ahmad, Abdulrahaman Shuaibu [3 ]
Chen, Xin [4 ]
Zhang, Xiaoyong [5 ]
机构
[1] Cent South Univ, Light Alloy Res Inst, Changsha 410083, Peoples R China
[2] Cent South Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Peoples R China
[3] Kano Univ Sci & Technol, Dept Mech Engn, Wudil, Nigeria
[4] Cranfield Univ, Welding Engn & Laser Proc Ctr, Bedford MK43 0AL, England
[5] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
关键词
Wire plus arc additive manufacture; Cold and warm rolling; Microstructure; Tensile properties; Strengthening mechanism; MECHANICAL-PROPERTIES; HEAT-TREATMENT; DELTA-PHASE; WIRE; ALLOY; SUPERALLOY; STRESS; RECRYSTALLIZATION; EVOLUTION; POROSITY;
D O I
10.1007/s43452-021-00356-7
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Despite the high efficiency and low cost of wire + arc additive manufacture (WAAM), the epitaxial grown columnar dendrites of WAAM deposited Inconel 718 cause inferior properties and severe anisotropy compared to the wrought components. Fundamental studies on the influence of one-pass cold and warm rolling on hardness and microstructure were investigated. Then the interpass cold and warm rolling on tensile properties were also analyzed. The results show that the one-pass rolling increases the hardness and displays a heterogeneous hardness distribution compared to the as-deposited material, and the warm rolling exhibits a larger and deeper strain compared to cold rolling. The columnar dendrites gradually change to cell dendrites under the rolling process and then change to equiaxed grains with the subsequent new layer deposition. The average grain size is 16.8 mu m and 23.5 mu m for the warm and cold rolling, respectively. The strongly textured columnar dendrites with preferred < 001 > orientation transform to equiaxed grains with random orientation after rolling process. The grain refinement contributes to the dispersive distributed strengthening phases and the increase in its fraction with heat treatment. The as-deposited samples show superior tensile properties compared to the cast material but inferior compared to the wrought components, while the warm-rolled samples show superior tensile properties to wrought material. Isotropic tensile properties are obtained in warm rolling compared to cold rolling. The rolling process and heat treatment both decrease the elongation and lead to a transgranular ductile fracture mode. Finally, the rolling-induced strengthening mechanism was discussed.
引用
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页数:14
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