Hydrogen embrittlement of nodular cast iron,Materials and Corrosion

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Hydrogen embrittlement of nodular cast iron
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-07-22 , DOI: 10.1002/maco.202011682
Patrik Sahiluoma ₁ , Yuriy Yagodzinskyy ₁ , Antti Forsström ₁ , Hannu Hänninen ₁ , Sven Bossuyt ₁

Affiliation

Ferritic nodular cast iron, intended for use as the material for inserts of canisters for long‐term geological disposal of spent nuclear fuel, was studied for hydrogen sensitivity. In the canisters, the insert provides the mechanical strength against external loads. Hydrogen was charged from 0.1 N H₂SO₄ solution in free‐corrosion tests and under controlled cathodic potential. Hydrogen uptake and trapping were then measured using thermal desorption spectroscopy. The hydrogen desorption rate after hydrogen charging manifests two distinct peaks. Plastic deformation during hydrogen charging increases the hydrogen uptake considerably. Hydrogen reduces the elongation to fracture and time to fracture in slow strain rate testing and constant load testing (CLT), respectively. Especially, the strain rate in CLT is dramatically increased. The appearance of hydrogen‐induced cracking in the ferrite phase changes from ductile dimple fracture to brittle cleavage fracture due to hydrogen charging, which initiates from the interphases of the graphite nodules. The results are discussed in terms of the role of hydrogen and the graphite nodules in hydrogen embrittlement of ductile cast iron.

中文翻译：

球墨铸铁的氢脆

研究了铁素体球墨铸铁的氢敏感性，该铁素体球墨铸铁用作乏核燃料的长期地质处置所用的碳罐插入物的材料。在滤罐中，插件可提供抵抗外部载荷的机械强度。从0.1 NH ₂ SO ₄充入氢气自由腐蚀测试和可控阴极电位下的解决方案。然后使用热解吸光谱法测量氢的吸收和捕集。充氢后的氢解吸速率表现出两个不同的峰。充氢过程中的塑性变形大大增加了氢的吸收。氢气分别在慢应变速率测试和恒定载荷测试（CLT）中降低了断裂伸长率和断裂时间。特别是，CLT中的应变率显着提高。由于充氢而使氢在铁素体相中出现裂纹，从延性的凹痕断裂变为脆性的断裂，这是从石墨球的相间开始的。

更新日期：2020-07-22

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