Additive manufacturing and mechanical properties of martensite/austenite functionally graded materials by laser engineered net shaping

被引：22

作者：

Zhang, Chi ^{[1
]}

Liu, Yang ^{[1
]}

Lu, Jiaqi ^{[1
]}

Xu, Like ^{[1
]}

Lin, Yaojun ^{[1
]}

Chen, Pingan ^{[2
]}

Sheng, Qiang ^{[1
]}

Chen, Fei ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

[2] Wuhan Univ Sci & Technol, Sch Mat & Met, Wuhan 430081, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 17卷

关键词：

Laser engineered net shaping; Functionally graded materials; Martensite; Austenite; Tensile properties; Thermodynamic modeling; TWINNING-INDUCED PLASTICITY; STAINLESS-STEEL; HEAT-TREATMENT; HIGH-STRENGTH; AUSTENITE; BEHAVIOR; TRANSFORMATION; FABRICATION; TI-6AL-4V; FRACTURE;

D O I：

10.1016/j.jmrt.2022.01.111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Laser engineered net shaping (LENS) is an advanced additive manufacturing technology combining rapid prototyping and synchronization technology. Its multi-powder feeder delivery system enables multi-materials building in single deposition, which is appropriate for additive manufacturing of functionally graded materials (FGMs). In this study, martensitic-stainless steel (MSS)/austenitic stainless steel (ASS) FGMs with composition transitioning from 100% MSS incrementally graded to 100% ASS by 25% composition gradients are fabricated by LENS. The Vickers hardness of MSS/ASS FGMs ranges from 358 to 170 HV. The decrease of hardness is found to relate to the grain-growth region with the increase of austenite. The obtained specimens of MSS/ASS FGMs show a tensile strength of 669 MPa and an elongation of 19%. In addition, the fracture location of MSS/ASS FGMs in tensile test is in the region of 100% ASS, which is dominated by austenite structure. Finally, the Scheil-Gulliver model is introduced to validate the phase formation of MSS/ASS FGMs' failure region. Experimental and modeling results indicate that precipitation of a-ferrite in the austenite structure leads to reduced ductility of MSS/ASS FGMs.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页码：1570 / 1581

页数：12

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