Fe_3Al合金堆焊层高温氧化机理研究  

Research of Oxidation Mechanism of Fe_3Al Overlayer at High Temperature

作　　者：王丽芳[1] 满达虎[1] 孙国栋[1] 

机构地区：[1]九江学院材料科学与工程学院,江西九江332005

出　　处：《热加工工艺》2007年第19期12-14,共3页Hot Working Technology

摘　　要：以Fe_3Al合金为焊丝,用钨极氩弧焊在不锈钢基体上进行堆焊,采用静态增重法测定堆焊层在850℃、950℃、1050℃和1150℃时的氧化动力学曲线。通过X射线衍射仪分析堆焊层及其高温氧化后的氧化膜组成。结果表明:堆焊层主要由Fe_3Al相构成,并含有少量的α-Fe固溶体;高温氧化时,起扩散阻隔作用的是α-Al_2O_3相;在试验氧化时间内,850℃和950℃氧化动力学曲线近似服从抛物线规律,1050℃和1150℃温度时则分段服从抛物线规律.存在破裂氧化现象,Cr元素的存在可能是造成两类不同动力学曲线的关键因素。Taking Fe3Al as welding wire, overlaying welding was conducted on austenite stainless steel using gas arc tungsten welding process. Oxidation dynamic curves of overlayer were obtained by the method of static mass gain at the temperatures of 850℃ , 950℃ , 1050℃ and 1150℃ . The components of oxide film of the overlayer aiter high-temperature oxidation could be analyzed by the .use of X-diffractometer. The results show that Fe3Al overlayer can be acquired, which contains a few α-Fe solid solution.Playing a part in diffusion and separation is α-Al2O3 phase in high-temperature oxidation. Within oxidation time, the oxidation curves at the temperatures of 850℃ and 950℃ follow parabolic law similarly, and follow parabolic law periodically at the temperatures of 1050℃ and 1150℃, furthermore, breaking oxidation can be observed. Cr is the primary reason for two kinds of different oxidation dynamic curves.

关 键 词：FE3AL合金 堆焊 抗氧化性能 钨极氩弧焊 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TG455[金属学及工艺—金属学]