Fe_3Al系合金环境氢脆研究SCIEI北大核心

研究了晶粒尺寸、形状、应变速率及预氧化对Ｆｅ_３Ａｌ系合金环境氢脆的影响，结果表明，细化晶粒能显著提高Ｆｅ_３Ａｌ合金在纯氧中的塑性及强度，但不能根本改善其环境氢脆敏感性；随着应变速率的提高，Ｆｅ_３Ａｌ合金在空气中的延伸率增加；Ｆｅ_３Ａｌ在空气及氢气中的脆化程度相似；预氧化能部分消除Ｆｅ_３（Ａｌ，Ｃｒ，Ｂ）合金的环境氢脆。实验结果可用表面化学反应是Ｆｅ_３Ａｌ材料环境致脆的控制步骤这一假设予以解释．

ENVIRONMENTAL EMBRITTLEMENT IN Fe_3Al BASED ALLOYS

The effect of various factors which include grain size/grain shape,strain rate and preoxidation,on environmental embrittlement of Fe_3Al based alloys has been investigated.Fe_3Al specimens with refined grain or columnar grain structure exhibit improved ductility and strength in both oxygen and air,however,the alloys still demonstrate severe environmental degradation.The severity of embrittlement is identical in air and gaseous hydrogen.As the strain rate increases,the ductility of Fe_3Al in both air and hydrogen is improved.Preoxidation can partly eliminate the environmental effect in Fe_3(Al,Cr,B) alloy.Surfaee reaction is supposed to be the controlling step in environment induced embrittlement of Fe_3Al based alloys.