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Achieving high strength and ductility in selective laser melting Ti-6Al-4V alloy by laser shock peening
被引:82
作者:

Lv, Jiming
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Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China

Luo, Kaiyu
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Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China

Lu, Haifei
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Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China

Wang, Zhao
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h-index: 0
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Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China

Liu, Jiajun
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Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China

Lu, Jinzhong
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h-index: 0
机构:
Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China
机构:
[1] Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Laser shock peening;
Selective laser melting;
Residual stress;
Ti-6Al-4V titanium alloy;
Microstructure;
Tensile property;
RESIDUAL-STRESS;
MECHANICAL-PROPERTIES;
GRAIN-REFINEMENT;
MICROSTRUCTURE EVOLUTION;
PLASTIC-DEFORMATION;
HEAT-TREATMENT;
TITANIUM;
PREDICTION;
BEHAVIOR;
STRAIN;
D O I:
10.1016/j.jallcom.2021.163335
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
In this work, the influences of laser shock peening (LSP) on the residual stress state, microstructures and mechanical properties of Ti-6Al-4V alloy fabricated by selective laser melting (SLM) were researched. Particularly, the microstructural evolution before and after LSP was clarified using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) observations. The results showed that the residual stress was adjusted from tensile to compressive state. Furthermore, high-density dislocations and a great number of parallel nano mechanical twins (nano-MTs) were promoted in the coarse lamellar alpha' structures, contributing to the grain refinement. The ultimate tensile strength and elongation of the SLM-manufactured (SLMed) Ti-6Al-4V alloy increased by approximately 14.3% and 18.3% after LSP treatment, respectively. Finally, the dominant mechanism of tensile property enhancement by LSP was revealed. High levels of compressive residual stress and grain refinement of the alpha' structures induced by LSP realized the excellent combination of strength and ductility. (c) 2021 Elsevier B.V. All rights reserved.
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