Role of grain size and anisotropy of neighboring grains in hydrogen-assisted intergranular fatigue crack initiation in austenitic stainless steel

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-08-09 DOI:10.1111/ffe.14404

Aman Arora, Mohit Singh, Varun Nair, Harpreet Singh, Dhiraj K. Mahajan

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Abstract

This study explores the impact of microstructural features on fatigue crack initiation in poly-crystalline materials, emphasizing hydrogen-induced complexities. Grain anisotropy, misorientations, grain size variations, and elastic–plastic inhomogeneities concentrate stress at grain boundaries, making them susceptible to crack initiation during fatigue loading. The presence of hydrogen compounds this process, due to complications of characterization of local hydrogen content and activating embrittling mechanisms. Building upon a model for nickel, this research investigates 316L austenitic stainless steel specimens with varying grain sizes, both uncharged and hydrogen-charged. In situ low-cycle fatigue loading experiments establish correlations between fatigue crack initiation and microstructural features. The study reveals specific combinations of features crucial in the initiation process, undergoing alterations in the presence of hydrogen. A proposed qualitative model links microstructural features with accumulated plastic shear strain during fatigue and prevalent hydrogen embrittlement mechanisms like hydrogen-enhanced local plasticity and hydrogen-enhanced decohesion.

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奥氏体不锈钢中晶粒尺寸和相邻晶粒各向异性在氢辅助晶间疲劳裂纹萌生中的作用

本研究探讨了微结构特征对多晶材料疲劳裂纹萌生的影响，强调了氢引起的复杂性。晶粒各向异性、取向错位、晶粒尺寸变化和弹塑性不均匀性会将应力集中在晶界，使其在疲劳加载过程中容易产生裂纹。氢的存在使这一过程变得复杂，因为局部氢含量的表征和激活脆化机制变得复杂。在镍模型的基础上，本研究对具有不同晶粒大小的 316L 奥氏体不锈钢试样进行了调查，试样既有不带电的，也有带氢的。原位低循环疲劳加载实验确定了疲劳裂纹起始与微结构特征之间的相关性。研究揭示了在起始过程中至关重要的特定特征组合，这些特征在氢的存在下会发生变化。所提出的定性模型将微观结构特征与疲劳过程中累积的塑性剪切应变以及普遍的氢脆机制（如氢增强局部塑性和氢增强脱黏）联系起来。

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

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.