载荷速率对充氢SA508-3钢断裂韧性的影响

doi:10.13251/j.issn.0254-6051.2020.10.044

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 231-235.DOI: 10.13251/j.issn.0254-6051.2020.10.044

载荷速率对充氢SA508-3钢断裂韧性的影响

刘家骅¹, 王磊², 杨玉芳¹, 崔君军^1,2, 耿浩彭¹

1.沈阳工学院数控机床信息物理融合与智能制造辽宁省重点实验室, 辽宁抚顺 113122;
2.东北大学材料各向异性与织构教育部重点实验室, 辽宁沈阳 110819

收稿日期:2020-05-16 出版日期:2020-10-25 发布日期:2020-12-29
作者简介:刘家骅(1985—),女,副教授,博士,主要研究方向为核电材料的失效行为,E-mail:liujiahua11@126.com
基金资助:
辽宁省教育厅2020年度科学研究经费项目(L202002)

Effect of loading rate on fracture toughness of H-charged SA508-3 steel

Liu Jiahua¹, Wang Lei², Yang Yufang¹, Cui Junjun^1,2, Geng Haopeng¹

1. Liaoning Key Laboratory of Information Physics Fusion and Intelligent Manufacturing for CNC Machine, Shenyang Institute of Technology, Fushun Liaoning 113122, China;
2. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang Liaoning 110819, China

Received:2020-05-16 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 采用高温高压气相热充氢方法将氢充入SA508-3钢,采用J积分方法比较不同载荷速率下未充氢与充氢钢的断裂韧性,考察氢对SA508-3钢断裂韧性的影响。结果表明,在相同载荷速率下,与未充氢SA508-3钢相比,充氢钢断裂韧性明显降低,充氢断口均为韧性和脆性混合断口形貌。随着载荷速率的降低,断裂韧性损失逐渐增加,准解理所占面积增加,脆性提高。在三向应力的作用下,氢与静水应力的交互作用能大于氢与可动位错的交互作用能,静水应力更易捕获到氢。SA508-3钢断裂韧性测试过程中,在三向应力的诱导下会促进氢富集在裂纹尖端碳化物和基体的界面处,从而降低了碳化物和基体的结合强度,致使阻碍裂纹扩展的能力减弱,因此钢充氢后断裂韧性降低。随着载荷速率的降低,三向应力作用在裂纹尖端的时间增加,氢富集在碳化物和基体界面浓度增加,氢压增强,加速裂纹扩展,钢的脆性提高,断裂韧性损失增加。

关键词: SA508-3钢, 加载速率, 氢, 断裂韧性

Abstract: Hydrogen (H) was charged into SA508-3 steel by high-pressure thermal charging method. The J-integral method was used to compare the fracture toughness of the H-charged and uncharged SA508-3 steels at different loading rates, and the effect of H on the fracture toughness of SA508-3 steel was investigated. The results indicate that at the same loading rate, the fracture toughness of the H-charged SA508-3 steel is obviously lower than that of the uncharged, and the fracture of the H-charged steel shows a mixing of ductile and brittle morphologies. With the decrease of loading rate, the loss of fracture toughness increases, the area of quasi-cleavage increases, and the brittleness increases. Under the action of three-direction stress, the interaction energy between H and hydrostatic stress is greater than that between H and mobile dislocation, and the hydrostatic stress is easier to capture H. In the process of fracture toughness test of SA508-3 steel, the three-direction stress can induce and promote H to enrich at the interface between the carbide and the matrix at the crack tip, thus reducing the bond strength between the carbide and the matrix and weakening the ability to hinder crack growth, so the fracture toughness of steel decreases after H charging. With the decrease of loading rate and the increase of the time of three-direction stress acting on the crack tip, the concentration of H at the carbide/matrix interface increases, the hydrogen pressure increases, so the crack growth is promoted and the brittleness of the steel increases, and the fracture toughness loss increases.

Key words: SA508-3 steel, loading rate, hydrogen, fracture toughness

中图分类号:

TG142.23

刘家骅, 王磊, 杨玉芳, 崔君军, 耿浩彭. 载荷速率对充氢SA508-3钢断裂韧性的影响[J]. 金属热处理, 2020, 45(10): 231-235.

Liu Jiahua, Wang Lei, Yang Yufang, Cui Junjun, Geng Haopeng. Effect of loading rate on fracture toughness of H-charged SA508-3 steel[J]. Heat Treatment of Metals, 2020, 45(10): 231-235.

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载荷速率对充氢SA508-3钢断裂韧性的影响

Effect of loading rate on fracture toughness of H-charged SA508-3 steel

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