Fe_3Al合金堆焊层的高温热腐蚀行为研究  

Hot Corrosion Behavior of Fe_3Al Overlay at High Temperatures

作　　者：徐道荣[1] 胡学安[1] 张伟伟[1] 何前进[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《机械工程材料》2006年第6期20-22,49,共4页Materials For Mechanical Engineering

摘　　要：用钨极氩弧焊方法在A304不锈钢基体上堆焊Fe_3Al合金,对其相组成进行了XRD分析,对堆焊试样在750℃和950℃温度下分别进行了Na_2SO_4盐和NaCl盐的热腐蚀试验。结果表明：堆焊层金属主要由Fe_3Al相构成,仅含有少量的α-Fe固溶体；堆焊层金属在NaCl盐中的热腐蚀程度明显高于在Na_2SO_4盐中的腐蚀,且堆焊层与基体的熔合区是最薄弱的区域。Overlaying welding was conducted on austenitic stainless steel A304 using gas arc tungsten welding process with Fe3Al as welding wire. NaCl-induced and Na2SO4-induced hot corrosion tests were conducted respectively at the temperatures of 750℃ and 950 ℃, Fe3Al overlay with some α-Fe solid solution could be acquired. NaCl-induced hot corrosion of Fe3Al overlay was much more severe than Na2SO4-induced corrosion. Fusion zone was most vulnerable place in both hot corrosion situation.

关 键 词：FE3AL合金 堆焊层 高温腐蚀 

分 类 号：TG172.6[金属学及工艺—金属表面处理]