Corrosion behavior of 316L austenitic steel processed by selective laser melting, hot-isostatic pressing, and casting

被引：98
|
作者：
Geenen, K. [1 ]
Roettger, A. [1 ]
Theisen, W. [1 ]
机构：
[1] Ruhr Univ Bochum, Inst Mat, Chair Mat Technol, Univ Str 150, D-44801 Bochum, Germany
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2017年 / 68卷 / 07期
关键词：
additive manufacturing; austenitic steel; corrosion resistance; hot-isostatic pressing; selective laser melting; STAINLESS-STEEL; MECHANICAL-PROPERTIES; POWDER; PARTS; MICROSTRUCTURE; 304L;
D O I：
10.1002/maco.201609210
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated the corrosion behavior of grade 316L austenitic steel processed by casting, hot isostatic pressing (HIP), selective laser melting (SLM), and SLM+HIP. Electrochemical results showed that the SLM-densified specimen exhibited poorer corrosion resistance than specimens processed by casting and hot isostatic pressing in solution-annealed condition. Microstructural investigations revealed that the SLM-densified specimen had a fine-grained microstructure but comparatively higher porosity, which negatively influenced corrosion resistance. Additional HIP treatment further worsened corrosion resistance. The HIP process does not significantly reduce porosity compared to the SLM process, which can be attributed to the argon atmosphere used when manufacturing the SLM samples. Nevertheless, it was possible to reduce the crack density via HIP treatment and the formerly lamellar oxides underwent spheroidization.
引用
收藏
页码：764 / 775
页数：12
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