Normalizing Effect of Heat Treatment Processing on 17-4 PH Stainless Steel Manufactured by Powder Bed Fusion
Normalizing Effect of Heat Treatment Processing on 17-4 PH Stainless Steel Manufactured by Powder Bed Fusion
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热处理工艺对粉床熔炼17-4PH不锈钢的正火效果
DOI：
10.3390/met12050704
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发表时间：
2022
期刊：
影响因子：
2.9
通讯作者：
Kyunsuk Choi
中科院分区：
文献类型：
--
作者：
S. Yeon;J. Yoon;Tae Bum Kim;Seung Ho Lee;T. Jun;Y. Son;Kyunsuk Choi
激光粉末床熔融（L-PBF）处理的17-4 PH不锈钢（SS）通常表现出主要由柱状δ-铁素体晶粒和相当大比例的残余奥氏体和马氏体组成的非平衡显微组织，而17-4 PH SS锻造有完全马氏体结构和粗晶粒。尽管L-PBF和锻造17-4 PH SS的微观结构不同，但通常使用常规热处理方法进行后处理。热处理对L-PBF产品的影响不足，在显微组织中产生δ-铁素体相。为了获得改善的机械性能，在氮气环境中L-PBF后的常规热处理中添加正火处理进行了研究。通过添加正火处理开发的完全马氏体基体含有均匀的Cu沉淀物，并且与锻造SS相比，表现出相似或改善的强度和断裂伸长率。
Laser powder bed fusion (L-PBF)-processed 17-4 PH stainless steel (SS) generally exhibits a non-equilibrium microstructure consisting mostly of columnar δ-ferrite grains and a substantial fraction of retained austenite and martensite, contrary to 17-4 PH SS wrought with a fully martensite structure and coarse grains. Despite the different microstructures of L-PBF and wrought 17-4 PH SS, post-processing is typically performed using the conventional heat treatment method. The insufficient effect of the heat treatment on the L-PBF product produces a δ-ferrite phase in the microstructure. To obtain improved mechanical properties, the addition of a normalizing treatment to the conventional heat treatment after L-PBF in a nitrogen gas environment was investigated. The fully martensitic matrix developed by adding the normalizing treatment contained homogeneous Cu precipitates and exhibited a similar or improved strength and elongation to failure compared to the wrought SS.