Fracture toughness of 304L austenitic stainless steel produced by laser powder b e d fusion

被引：32
|
作者：
Kumar, Punit [1 ]
Zhu, Zhiguang [2 ]
Nai, Sharon M. L. [2 ]
Narayan, R. L. [3 ]
Ramamurty, U. [1 ,4 ]
机构：
[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
[2] Singapore Inst Mfg Technol, 73 Nanyang Dr, Singapore 637662, Singapore
[3] Indian Inst Technol, Dept Mat Sci & Engn, New Delhi 110016, India
[4] ASTAR, Inst Mat Res & Engn, Singapore 138634, Singapore
来源：
SCRIPTA MATERIALIA | 2021年 / 202卷
关键词：
Additive manufacturing; Austenitic steels; Fracture; Toughness; Martensitic phase transformation; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; HARDENING BEHAVIOR; HEAT-TREATMENT; STRENGTH; MICROSTRUCTURE; TEMPERATURE; MARTENSITE; ENERGY;
D O I：
10.1016/j.scriptamat.2021.114002
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Uniaxial tensile response and J integral-resistance behavior of 304L austenitic stainless steel manufactured by laser powder bed fusion process (LPBF) were investigated. The steel undergoes transformation induced plasticity (TRIP) at room temperature, resulting in high fracture toughness (J(Q)) values combined with high strength (sigma(Y)) and ductility. Upon increasing the temperature to 75 degrees C, TRIP becomes inactive, and the deformation mechanism is dominated by dislocation glide and twinning. This leads to a substantial reduction in J(Q) and marked anisotropy, while sigma(Y) remains unchanged. Significance of these results in terms of fracture properties of steels manufactured via LPBF processes is discussed. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：6
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