Heat treatment effect on the microstructure, mechanical properties, and wear behaviors of stainless steel 316L prepared via selective laser melting

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:806

Article

Shin, Won-Sang¹  Son, Bongkuk^2,3  Song, Wansu⁴  Sohn, Hyonkee³  Jang, Ho⁴  Kim, Yoon-Jun¹  Park, Changkyoo³ 

[1] Inha Univ, Dept Mat Sci & Engn, Incheon 22212, South Korea

[2] Chungnam Natl Univ, Dept Convergence Syst Engn, Daejeon 34134, South Korea

[3] Korea Inst Machinery & Mat, Laser & Electron Beam Applicat Dept, Daejeon 34103, South Korea

[4] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea

关键词: Selective laser melting;    Stainless steel 316L;    Heat treatment;    Microstructural evolution;    Mechanical properties;    Wear behavior;   

DOI  :  10.1016/j.msea.2021.140805

来源: Elsevier

【 摘 要 】

The influence of heat treatment on the microstructure, mechanical properties, and wear behaviors of stainless steel 316L (SS316L) produced via selective laser melting (SLM) was investigated. The fabricated SLM samples were subjected to two different heat treatments: a typical furnace-type heat treatment conducted at 1100 degrees C for 0.5 h and hot isostatic pressing performed at 1100 degrees C and 100 MPa for 1.5 h. High-density SLM samples with low porosities were obtained by increasing the laser power and decreasing the scan speed. The heat treatments of the fabricated SLM samples induced the removal of porosity, cellular microstructure, and dense dislocation structures with a slight increase in grain size. In terms of mechanical properties, the fabricated SLM samples exhibited similar hardness and tensile strength properties to those of the conventional SS316L, while a significantly lower elongation was evident. The heat treatments of the fabricated SLM samples improved elongation, while the surface hardness and tensile strength decreased owing to microstructural evolution. During the pin-on-disk test, the conventional SS316L and fabricated SLM sample exhibited similar wear resistance values, which decreased after the heat treatments of the fabricated SLM samples owing to the heat treatment-induced surface softening.

【 授权许可】

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