Additive manufacturing of fatigue resistant austenitic stainless steels by understanding process-structure?property relationships

被引：51
|
作者：
Pegues, Jonathan W. [1 ,2 ]
Roach, Michael D. [3 ]
Shamsaei, Nima [1 ,2 ]
机构：
[1] Auburn Univ, Dept Mech Engn, Auburn, AL 36849 USA
[2] Auburn Univ, NCAME, Auburn, AL 36849 USA
[3] Univ Mississippi, Med Ctr, Dept Biomed Mat Sci, Jackson, MS 39216 USA
来源：
MATERIALS RESEARCH LETTERS | 2020年 / 8卷 / 01期
基金：
美国国家科学基金会;
关键词：
Laser beam-powder bed fusion; crack initiation; microstructure; twin boundary; cyclic deformation; MECHANICAL-BEHAVIOR; CRACK INITIATION; MICROSTRUCTURE; TI-6AL-4V; NICKEL; PERFORMANCE; BOUNDARIES; DEFECTS; 304L;
D O I：
10.1080/21663831.2019.1678202
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The limited understanding of additive manufacturing process-structure?property inter-relationships raises some concerns regarding the structural reliability, which limits the adoption of this emerging technology. In this study, laser beam-powder bed fusion is leveraged to fabricate an austenitic stainless steel with a microstructure containing minimal known crack initiation features. Ex-situ microstructural observations of the crack initiation features and mechanisms are carried out for interrupted fatigue tests via electron backscatter diffraction mapping of the micro-cracks. Results show that the additive manufactured stainless steel alloy has improved fatigue resistance compared to its wrought counterpart as a result of the unique microstructural features. Impact statement Using an experimental ex-situ microstructural investigation, the fatigue resistance of additive manufactured 304L stainless steel was shown to be superior to the wrought counterpart by avoiding the typical failure mechanisms.
引用
收藏
页码：8 / 15
页数：8
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