应力三轴度对淬火态硼钢氢脆敏感性的影响

doi:10.11901/1005.3093.2021.243

材料研究学报

2022, Vol. 36

Issue (10): 739-746 DOI: 10.11901/1005.3093.2021.243

研究论文

本期目录 | 过刊浏览

应力三轴度对淬火态硼钢氢脆敏感性的影响

张渤涛¹^,², 李淑慧¹^,²(

), 李永丰¹^,², 韩国丰¹^,²

^1.上海交通大学机械系统与振动国家重点实验室上海 200240
^2.上海交通大学上海市复杂薄板结构数字化制造重点实验室上海 200240

Effect of Stress Triaxiality on Hydrogen Embrittlement Susceptibility of Quenched Boron Steel B1500HS

ZHANG Botao¹^,², LI Shuhui¹^,²(

), LI Yongfeng¹^,², HAN Guofeng¹^,²

^1.State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China
^2.Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, China

引用本文:

张渤涛, 李淑慧, 李永丰, 韩国丰. 应力三轴度对淬火态硼钢氢脆敏感性的影响[J]. 材料研究学报, 2022, 36(10): 739-746.
Botao ZHANG, Shuhui LI, Yongfeng LI, Guofeng HAN. Effect of Stress Triaxiality on Hydrogen Embrittlement Susceptibility of Quenched Boron Steel B1500HS[J]. Chinese Journal of Materials Research, 2022, 36(10): 739-746.

全文: PDF(11671 KB) HTML

摘要:

对硼钢进行电化学充氢和低应变率拉伸,分别画出了纯剪切、单向拉伸及近似平面应变状态下淬火态硼钢充氢前后的应力-应变曲线,并基于等效塑性应变量化了硼钢的氢脆敏感性,研究了应力三轴度对淬火态硼钢的力学性能和氢脆敏感性的影响。用SEM及EBSD表征试样断口的微观组织,根据淬火态硼钢充氢前后断裂模式的变化分析了硼钢在不同应力状态下的氢脆机理。结果表明,淬火态硼钢在剪应力状态下的氢脆机理与拉伸应力状态显著不同,使其氢脆敏感性比拉伸应力状态显著降低。

关键词 ：金属材料, 淬火态硼钢, 氢脆, 敏感性, 应力三轴度

Abstract：

The Hydrogen embrittlement (HE) susceptibility of the quenched boron steel B1500HS before and after being electrochemical hydrogen charging by applying different stresses, such as simple shear, uniaxial tensile and analogous plane strain, respectively was investigated via slow strain rate tensile test. Meanwhile, the stress-strain curves for both the H-free and H-charged steels were acquired and then the HE susceptibility of the test steels was calculated based on the equivalent plastic strain to reveal the effects of the stress state on the HE susceptibility of the quenched boron steel. Furthermore, the fracture features of the steels were characterized by SEM and EBSD to analyze the HE mechanism for the different applied stress. The results show that the HE mechanisms of the quenched boron steel by simple shear stress is substantial different to those by tensile stress, which indicated that the HE susceptibility during testing by simple shear stress is much lower than that by tensile stress.

Key words： metallic material quenched boron steel hydrogen embrittlement susceptibility stress triaxiality

收稿日期: 2021-04-15

ZTFLH:

TG 156.3

基金资助:国家自然科学基金(52005329);中国博士后科学基金(2020M671120)

作者简介: 张渤涛,男,1979年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.243 或 https://www.cjmr.org/CN/Y2022/V36/I10/739

表1 B1500HS钢的化学成分

图1 硼钢淬火前后的微观组织

图2 淬火态硼钢的XRD衍射谱

图3 单向拉伸试样、带缺口试样和简单剪切试样的尺寸

图4 各拉伸试样对应的应力三轴度

图5 单拉试样、带缺口试样和简单剪切试样充氢前后的应力应变曲线

表2 代表三种不同应力三轴度的试样在预充氢和未充氢情况下的拉伸极限等效塑性应变

图6 淬火态硼钢在不同应力三轴度下的氢脆敏感性

图7 未充氢和预充氢简单剪切试样断口的形貌

图8 未充氢和预充氢单拉试样断口的形貌

图9 未充氢和预充氢试样断口的形貌

图10 各试样充氢前后断口表面下方的EBSD分析

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