中硅耐热铸铁的氢脆与预防

Hydrogen Brittleness of Medium Sition Heat Resistant Nodular Cast Iron and Prevention

通过对中硅耐热球铁氢含量的化学分析，用离子探针测定氢的微区分布，初步证实中硅耐热球铁中存在一定数量的氢，且易在含Ｓｉ量高的部位富集，并由此引起氢脆，对氢在α－Ｆｅ中的固溶机制做了简要的推论，并提出预防或减轻中硅耐热球铁氢脆的途径．

H content in medium silion heat resistant nudular cast iron was studied by chemical analysis and the distribution of micr-area of hydrogen was measured by IMPA. It is found primaryly that a quantity of H is in medium silion heat resistant nodular cast iron and H is tend to gather in area where Si content is high, which leads to hydrogen brittleness. The solution mechanism of hydrogen in a-Fe was briefly discussed and the method to prevent or reduce hydrogen brittleness was provided in this article.