Improved corrosion resistance of powder manufactured AISI 904L parts by hot isostatic pressing post treatment

A Sorea, P Valler, P Kjeldsteen, P Hjelmeborn
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Abstract

Metal binder jetting (MBJ) of AISI 904L super austenitic stainless steel makes it possible to produce complex components with a higher corrosion resistance compared to austenitic stainless steels such as AISI 304L and AISI 316L. The initial sintering trials resulted in a porous part with low corrosion resistance. As AISI 904L is a steel with austenitic phase throughout the entire sintering window, densification during sintering was inhibited which resulted in the reduced corrosion resistance due to open porosities. The trials were made with AISI 904L powder suited for MBJ but shaped through metal powder extrusion due to lack of printer availability. This paper will show how to enhance densification and utilize pickling in order to improve the corrosion resistance closer to the expected level comparable to cast and rolled material but with the shaping possibilities of MBJ.
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通过热等静压后处理提高粉末制造的 AISI 904L 零件的耐腐蚀性能
与 AISI 304L 和 AISI 316L 等奥氏体不锈钢相比,AISI 904L 超级奥氏体不锈钢的金属粘合剂喷射(MBJ)使生产耐腐蚀性更强的复杂部件成为可能。最初的烧结试验产生了耐腐蚀性较低的多孔部件。由于 AISI 904L 是一种在整个烧结窗口都具有奥氏体相的钢材,因此烧结过程中的致密化受到了抑制,这就导致了开孔造成的耐腐蚀性降低。试验使用的是适合 MBJ 的 AISI 904L 粉末,但由于缺乏打印机,只能通过金属粉末挤压成型。本文将介绍如何加强致密化和利用酸洗来提高耐腐蚀性,使其更接近与铸造和轧制材料相媲美的预期水平,但又具有 MBJ 成型的可能性。
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