Enhancement of an additive-manufactured austenitic stainless steel by post-manufacture heat-treatment

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

卷:759

Article

Chen, Nan¹  Ma, Guoqiang¹  Zhu, Wanquan¹  Godfrey, Andrew²  Shen, Zhijian³  Wu, Guilin¹  Huang, Xiaoxu^1,4 

[1] Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys MOE, Chongqing 400044, Peoples R China

[2] Tsinghua Univ, Sch Mat Sci & Engn, Lab Adv Mat MOE, Beijing 100084, Peoples R China

[3] Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden

[4] Tech Univ Denmark, Dept Mech Engn, DK-2800 Lyngby, Denmark

关键词: Additive manufacturing;    316L stainless steel;    Heat-treatment;    Mechanical properties;    Orowan strengthening;   

DOI  :  10.1016/j.msea.2019.04.111

来源: Elsevier

【 摘 要 】

The effect of post-manufacture heat-treatment on the mechanical strength of an additively-manufactured austenitic stainless steel has been investigated. Microstructural investigations revealed that the as-manufactured material exhibited a multi-scale structure, composed of grains, cells, dislocations and nano-sized particles. Annealing at 400 degrees C resulted in a 10% increase in yield strength, associated with the additional precipitation of a population of nano-sized silicates. Annealing at higher temperatures resulted in a decrease in strength, attributed primarily to the thermal instability of the cell structure in the as-manufactured material. The results demonstrate that by careful control of annealing conditions the structure and mechanical properties of additively-manufactured austenitic stainless steel can be optimized by post-manufacture heat-treatment.

【 授权许可】

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