A precipitation hardened austenitic stainless steel with excellent stress corrosion cracking resistance against high-temperature water

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

Corrosion Science Pub Date : 2025-09-22 DOI:10.1016/j.corsci.2025.113352

Yuhao Zhou , Huayan Hu , Cheng Peng , Jie Liu , Yihan Zhao , Xiaoqing Shang , Can Guo , Zhao Shen , Miao Song , Lefu Zhang , Kai Chen

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Abstract

High-strength steels are susceptible to stress corrosion cracking (SCC). We developed a precipitation-hardened austenitic stainless steel via laser powder bed fusion that unexpectedly resists SCC in high-temperature water. It features weak texture and equiaxed crystals around dendrites, resulting in near-isotropic SCC behavior. Solidification segregation during solidification forms TiAlNi₂ precipitates at cell boundaries. These nano-scale TiAlNi₂ precipitates undergo preferential corrosion, initiating intragranular cracks, but blunt SCC-tips cease at these precipitates. Ti, Al and Ni from TiAlNi₂ spontaneously diffuse along phase interfaces toward the SCC front, and nearby TiAlNi₂ reduce the strain concentration, both of which enhance the SCC re-passivation. Furthermore, the multilevel strain buffer forms ahead of the blunt SCC edge, creating compressive strain at SCC tips that hinders propagation. This study provides a new strategy to improve SCC resistance through precipitation at dislocation cell boundaries in additively manufactured alloys.

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一种沉淀硬化奥氏体不锈钢，具有优异的抗高温水应力腐蚀开裂性能

高强度钢易发生应力腐蚀开裂（SCC）。我们通过激光粉末床熔合开发了一种沉淀硬化奥氏体不锈钢，出人意料地抵抗高温水中的SCC。它具有弱织构和围绕枝晶的等轴晶体，导致近各向同性SCC行为。凝固过程中的凝固偏析在晶胞边界处形成TiAlNi2析出物。这些纳米级TiAlNi2析出物优先腐蚀，引发晶内裂纹，但钝化的scc尖端在这些析出物处停止。TiAlNi2中的Ti、Al和Ni自发地沿相界面向SCC前沿扩散，TiAlNi2附近的应变浓度降低，均增强了SCC的再钝化。此外，多级应变缓冲在钝SCC边缘之前形成，在SCC尖端产生压缩应变，阻碍传播。本研究为增材制造合金中通过位错胞界析出提高抗SCC性能提供了新策略。

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.