Hydrogen‐induced stress corrosion cracking studied by the novel tuning‐fork test method,Materials and Corrosion

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Hydrogen‐induced stress corrosion cracking studied by the novel tuning‐fork test method
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-06-08 , DOI: 10.1002/maco.202011767
Renata Latypova ₁ , Tun Tun Nyo ₁ , Timo Kauppi _{1,

2} , Sakari Pallaspuro ₁ , Saara Mehtonen ₃ , Hannu Hänninen ₄ , Jukka Kömi ₁

Affiliation

A novel tuning‐fork test method was developed to study hydrogen‐induced stress corrosion cracking of high‐strength steels. Special tuning‐fork specimens are designed to enable accurate stress adjustment via constant displacement under cathodic hydrogen charging conditions. In this study, the testing method is further developed, making the potentiostatic hydrogen charging possible through the modifications of the corrosion cell. Different direct‐quenched, low‐ and medium‐carbon steel grades, with a hardness range of 300–550 HBW, are investigated with both galvanostatic and potentiostatic hydrogen charging techniques. For each steel grade, the lowest fracture stress and highest no‐fracture stress are determined. Both hydrogen charging techniques produce similar results, and it is observed that the fracture stress decreases with the increase in hardness. However, the potentiostatic technique produces larger differences between the lowest fracture stress results, thus having a better resolution.

中文翻译：

新型音叉试验方法研究氢致应力腐蚀开裂

开发了一种新颖的音叉测试方法来研究氢引起的高强度钢的应力腐蚀开裂。特殊的音叉样本旨在通过在阴极充氢条件下的恒定位移实现精确的应力调节。在这项研究中，测试方法得到了进一步的发展，通过修改腐蚀池使恒电位的氢充入成为可能。使用恒电流和恒电位充氢技术研究了硬度范围为300–550 HBW的不同直接淬火，低碳和中碳钢种。对于每种钢种，确定了最低的断裂应力和最高的无断裂应力。两种充氢技术均产生相似的结果，并且观察到断裂应力随着硬度的增加而减小。但是，恒电位技术在最低的断裂应力结果之间会产生较大的差异，因此具有更好的分辨率。

更新日期：2020-06-08

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