提高304奥氏体不锈钢焊缝抗氢脆性能的氮介质热处理和显微组织工程

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-25 DOI:10.1016/j.ijfatigue.2025.109021

Jinxin Xue , Haixiang Wang , Xiang Li , Junyang Chen , Xinfeng Li , Lin Zhang , Chilou Zhou

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引用次数: 0

摘要

研究了304奥氏体不锈钢氮气氛热处理工艺参数与抗氢脆性能的关系。通过原位慢应变速率拉伸（SSRT）和疲劳裂纹扩展速率（FCGR）试验，定量评价氢暴露下的HE敏感性。热处理温度对HE电阻有关键影响，在600°C时效果最大（RRA = 0.701）。利用电子背散射衍射（EBSD）和扫描开尔文探针力显微镜（SKPFM）进行的多尺度显微结构表征揭示了双重强化机制：精细的晶粒结构限制氢的进入，而策略分布的晶界沉淀（CrxN）则是氢渗透的有效物理屏障。这些同时发生的微观结构修饰协同增强了对氢诱导降解的抵抗力，为优化热处理方案提供了基本的见解，以提高对HE的抵抗力。

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Nitrogen-mediated heat treatment and microstructural engineering for enhanced hydrogen embrittlement resistance in 304 austenitic stainless steel welds

A comprehensive investigation was conducted to elucidate the correlation between nitrogen-atmosphere heat treatment parameters and hydrogen embrittlement (HE) resistance in 304 austenitic stainless steel weldments. The HE susceptibility was quantitatively evaluated through in-situ slow strain rate tensile (SSRT) and fatigue crack growth rate (FCGR) tests under hydrogen exposure. Heat treatment temperature exhibited a critical influence on HE resistance, with maximum effectiveness observed at 600 °C (RRA = 0.701). Multi-scale microstructural characterization employing electron backscatter diffraction (EBSD) and scanning Kelvin probe force microscopy (SKPFM) revealed dual strengthening mechanisms: refined grain structure restricting hydrogen ingress and strategically distributed grain boundary precipitates (Cr_xN) acting as effective physical barriers to hydrogen penetration. These concurrent microstructural modifications synergistically enhanced the resistance to hydrogen-induced degradation, providing fundamental insights into the optimization of heat treatment protocols for improved HE resistance.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.