振动铸轧细晶对板带氢脆敏感性的影响机理

中国机械工程

振动铸轧细晶对板带氢脆敏感性的影响机理

孙明翰;李凌霄;范美辰;郭仕鹏;杜凤山

燕山大学国家冷轧板带装备及工艺工程技术研究中心，河北秦皇岛，066004

出版日期:2019-12-25 发布日期:2019-12-27
基金资助:
国家自然科学基金资助项目(U1604251)；
河北省自然科学基金资助项目(E2017203043)；
燕山大学研究生创新支持计划资助项目(CXZS201901)

Influence Mechanism of Grain Refining Effect Caused by Vibration Cast-rolling on Strip Hydrogen Embrittlement Susceptibility

SUN Minghan;LI Lingxiao;FAN Meichen;GUO Shipeng;DU Fengshan

National Research Center of Cold Rolling Strip Equipment and Process Engineering, Yanshan University, Qinhuangdao, Hebei, 066004

Online:2019-12-25 Published:2019-12-27

摘要/Abstract

摘要： 研究了振动铸轧的细晶作用对板带氢脆敏感性的影响，在电化学充氢后对振动铸轧与传统铸轧的板坯进行了慢应变拉伸实验，以评价其氢脆敏感性。结果表明，振动铸轧能使铸轧板坯的氢脆敏感性大幅下降。根据振动铸轧板坯与传统铸轧板坯的实际晶粒尺寸构建了晶体塑性有限元模型，对不同晶粒度板坯的氢扩散过程进行数值模拟。研究发现，晶粒细化能够显著减小表观氢扩散系数，在相同临氢环境下减小可扩散氢含量。

关键词: 铸轧, 氢脆, 晶粒度, 晶体塑性, 氢扩散系数

Abstract: Influence mechanism of grain refining effect caused by vibration cast-rolling on strip hydrogen embrittlement susceptibility was studied. In order to evaluate the hydrogen embrittlement sensitivity of vibration cast-rolled strips, slow strain tensile tests were carried out after electrochemical hydrogen charging. The results show that the hydrogen embrittlement susceptibility of cast-rolled strips may be greatly reduced by the new processes of vibration cast-rolling. A crystal plastic finite element model was established to simulate the hydrogen diffusion processes of strips with different grain sizes based on the actual grain sizes of vibration cast-rolled strips and conventional cast-rolled strips. It is found that grain refinement may significantly reduce the apparent hydrogen diffusion coefficient, and reduce the diffusible hydrogen content under the same hydrogen environments.

Key words: cast rolling, hydrogen embrittlement, grain size, crystal plastic, hydrogen diffusion coefficient

中图分类号:

TG179

孙明翰;李凌霄;范美辰;郭仕鹏;杜凤山. 振动铸轧细晶对板带氢脆敏感性的影响机理[J]. 中国机械工程.

SUN Minghan;LI Lingxiao;FAN Meichen;GUO Shipeng;DU Fengshan. Influence Mechanism of Grain Refining Effect Caused by Vibration Cast-rolling on Strip Hydrogen Embrittlement Susceptibility[J]. China Mechanical Engineering.

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