Evaluation of defect density, microstructure, residual stress, elastic modulus, hardness and strength of laser-deposited AISI 4340 steel

被引：146
作者：
Sun, Guifang [1 ,2 ]
Zhou, Rui [3 ]
Lu, Jinzhong [4 ]
Mazumder, Jyotirmoy [2 ]
机构：
[1] Southeast Univ, Sch Mech Engn, Nanjing 211189, Jiangsu, Peoples R China
[2] Univ Michigan, Ctr Laser Aided Intelligent Mfg, Ann Arbor, MI 48109 USA
[3] Jiangsu Univ Sci & Technol, Sch Mech & Met Engn, Zhangjiagang 215600, Peoples R China
[4] Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Jiangsu, Peoples R China
来源：
ACTA MATERIALIA | 2015年 / 84卷
基金：
美国国家科学基金会; 国家教育部博士点专项基金资助;
关键词：
Laser deposition; Microstructure; Thermal analysis; Nanoindentation; Fracture; IN-SITU OBSERVATION; DIRECT METAL-DEPOSITION; SURFACE TREATMENTS; FATIGUE BEHAVIOR; ALLOYED LAYERS; CARBON-STEEL; EVOLUTION; TOOL; ALUMINUM; TRANSFORMATIONS;
D O I：
10.1016/j.actamat.2014.09.028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Laser-aided direct metal deposition (DMD) was used to form a AISI 4340 steel coating on an AISI 4140 steel substrate. Stress in the coating was relieved before mechanical testing. The defect density and microstructural property of the DMD coating were analyzed. The thermal analysis, continuous cooling transformation (CCT), residual stress, micro-hardness, nano-hardness and elastic modulus of the DMD coating before and after stress relief were studied. Tensile testing, lap shear testing and bend testing were done on the stress-relieved DMD coatings. Finally, evaluation of the effect of porosity on fracture behavior was characterized. A porosity and residual stress-based fracture mechanism was proposed. A better deposition strategy is needed to improve the microstructure (decrease porosity), and the mechanical properties of DMD could be tailored through appropriate heat treatments. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：172 / 189
页数：18
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