Influence of substructures on the selective laser melted Ti-6Al-4V alloy as a function of laser re-melting

被引：28

作者：

Karimi, J. ^{[1
]}

Xie, M. S. ^{[2
]}

Wang, Z. ^{[2
]}

Prashanth, K. G. ^{[1
,3
,4
]}

机构：

[1] Tallinn Univ Technol, Dept Mech & Ind Engn, Ehitajate Tee 5, EE-19086 Tallinn, Estonia

[2] South China Univ Technol, Guangdong Key Lab Adv Metall Mat Proc, Guangzhou 510640, Guangdong, Peoples R China

[3] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[4] Vellore Inst Technol, Sch Engn, CBCMT, Vellore 632014, Tamil Nadu, India

来源：

JOURNAL OF MANUFACTURING PROCESSES | 2021年 / 68卷

基金：

中国国家自然科学基金;

关键词：

Selective laser melting; Microstructure; Substructure; Twin; Dislocation density; Ti6Al4V; RESIDUAL-STRESS DISTRIBUTION; TENSILE PROPERTIES; MICROSTRUCTURE; MARTENSITE; SIMULATION; DENSITY; PARTS;

D O I：

10.1016/j.jmapro.2021.06.059

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the effects of melting sequence on the microstructure, substructure, and mechanical properties of SLM Ti6Al4V alloys. Acicular alpha ' martensite was observed in all the SLM samples, and the dimensions of the alpha ' phase were changed with the melting sequence. Twins appear between acicular alpha ' martensite, and a large number of dislocations were observed in the material and within alpha ' martensite. The density of twins and dislocations increased with increasing melting sequence from single melting to triple melting. Tensile strength properties including ultimate tensile strength and yield stress, and hardness increased with increasing melting sequence from single melting to triple melting. The present results clearly prove that the melting sequence plays a significant role in determining the microstructure, substructure, and mechanical properties of the SLM as-built materials.

引用

页码：1387 / 1394

页数：8

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