Corrosion and stress corrosion cracking resistances of laser powder bed fused and binder jetted 316L austenitic stainless steel

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-04-22 DOI:10.1016/j.corsci.2025.112968

Yida Xiong , Wei Shi , Ting Zhao , Eiji Akiyama , Upadrasta Ramamurty

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引用次数: 0

Abstract

The microstructures of additively manufactured (AM) alloys depend on the specific AM method employed and are distinct from their conventionally manufactured (CM) counterparts. The complex interplay between such microstructural variations and porosity on the corrosion and stress corrosion cracking (SCC) properties of the 316L austenitic stainless steel produced using CM, laser powder bed fusion (LPBF), binder jet printing (BJP), and BJP+hot isostatic pressing (HIP) techniques were investigated and compared. The resistance of the steels to localized corrosion resistance has the following order: BJP < (BJP + HIP) ≈ CM < LPBF, while their SCC resistance ranked as BJP < LPBF ≈ CM < (BJP + HIP). BJP 316L’s lowest resistance is due to the combined effects of the high fractions of δ-ferrite, σ-phase and porosity present in it. The rapid solidification conditions prevalent during LPBF result in the refinement of the Mn-Si-O inclusions and complete elimination of the MnS inclusions. Both these features impart superior localized corrosion resistance to LPBF 316L. However, pit growth and crack propagation are facilitated by high residual strain within its microstructure, making its SCC resistance comparable to that of CM 316L. HIP after BJP led to a substantial reduction of δ-ferrite fraction and porosity. Both these factors significantly enhance the localized corrosion resistance and make the BJP+HIP 316L’s SCC resistance superior. The results of this work demonstrate the need for a close examination of the effect of different microstructural features and porosity induced by AM on the corrosion and SCC resistances of alloys for ensuring structural integrity of AM components in aggressive environments.

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316L奥氏体不锈钢激光粉末床熔合和粘结剂喷射的耐腐蚀和应力腐蚀开裂性能

增材制造（AM）合金的微观结构取决于所采用的具体增材制造方法，并且与传统制造（CM）合金不同。研究了采用激光粉末床熔合（LPBF）、粘结剂喷射打印（BJP）和BJP+热等静压（HIP）技术生产的316L奥氏体不锈钢的腐蚀和应力腐蚀开裂（SCC）性能与微观组织变化和孔隙率之间的复杂相互作用。钢的抗局部腐蚀性能顺序为：BJP <； (BJP + HIP)≈ CM <； LPBF，抗SCC性能顺序为BJP <； LPBF≈ CM <； （BJP + HIP）。BJP 316L具有较低的电阻，这是由于其含有大量的δ-铁氧体、σ-相和气孔的共同作用。LPBF过程中普遍存在的快速凝固条件导致Mn-Si-O夹杂物的细化和MnS夹杂物的完全消除。这两种特性赋予LPBF 316L优越的局部耐腐蚀性。然而，其显微组织内的高残余应变有利于坑扩展和裂纹扩展，使其抗SCC性能与CM 316L相当。BJP后的HIP导致δ-铁素体分数和孔隙率大幅降低。这两种因素都显著提高了BJP+HIP 316L的局部耐蚀性，使其耐SCC性能优越。这项工作的结果表明，需要仔细研究增材制造引起的不同微观结构特征和孔隙率对合金耐腐蚀和抗SCC性能的影响，以确保增材制造部件在腐蚀性环境中的结构完整性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.