Effect of Heat Treatment Conditions on Corrosion and Hydrogen Diffusion Behaviors of Ultra-Strong Steel Used for Automotive Applications

IF 0.8 Q4 ELECTROCHEMISTRY
Jin-seong Park, H. Seong, S. Kim
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引用次数: 6

Abstract

of them focused on the mechanical degradation of pre-charged steel under electrochemical cathodic polarization, and the corrosion behaviors on the steel surface were not considered. In particular, there have been a limited number of studies on the ef-fects of microstructural modifications by heat treatment on the corrosion and HE of ultra-strong automotive steel. Therefore, this study examined the corrosion-induced HE of ultra-strong steel samples prepared under different heat treatment conditions, and the controlling factors for corro-Effect The purpose of this study was to examine the influence of conditions for quenching and/or tempering on the corrosion and hydrogen diffusion behavior of ultra-strong automotive steel in terms of the localized plastic strain related to the dislocation density, and the precipitation of iron carbide. In this study, a range of analytical and experimental methods were deployed, such as field emission-scanning electron microscopy, electron back scatter diffraction, electrochemical permeation technique, slow-strain rate test (SSRT), and electrochemical polarization test. The results showed that the hydrogen diffusion parameters involving the diffusion kinetics and hydrogen solubility, obtained from the permeation experiment, could not be directly indicative of the resistance to hydrogen embrittlement (HE) occurring under the condition with low hydrogen concentration. The SSRT results showed that the partitioning process, leading to decrease in localized plastic strain and dislocation density in the sample, results in a high resistance to HE-induced by aqueous corrosion. Conversely, coarse iron carbide, precipitated during heat treatment, weakened the long-term corrosion resistance. This can also be a controlling factor for the development of ultra-strong steel with superior corrosion and HE resistance.
热处理条件对汽车用超强钢腐蚀和氢扩散行为的影响
其中着重研究了电化学阴极极化作用下预充液钢的力学降解,未考虑钢表面的腐蚀行为。特别是,关于热处理微观组织改变对超高强度汽车钢的腐蚀和HE的影响的研究数量有限。因此,本研究考察了不同热处理条件下制备的超强钢样品的腐蚀诱导HE,以及腐蚀效应的控制因素。本研究的目的是从位错密度相关的局部塑性应变和碳化铁析出的角度研究淬火和/或回火条件对超强汽车钢腐蚀和氢扩散行为的影响。本研究采用了场发射扫描电镜、电子背散射衍射、电化学渗透技术、慢应变速率测试(SSRT)和电化学极化测试等一系列分析和实验方法。结果表明,通过渗透实验得到的氢扩散动力学和氢溶解度参数不能直接反映低氢浓度条件下的抗氢脆(HE)。SSRT结果表明,分配过程导致试样局部塑性应变和位错密度的降低,从而使试样具有较高的抗he水腐蚀性能。相反,热处理过程中析出的粗铁碳化物削弱了长期耐蚀性。这也是开发具有优异腐蚀和抗HE性能的超强钢的控制因素。
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
CiteScore
1.30
自引率
66.70%
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