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采用TIG弧堆焊方法,在Q235基体上制备了以铁基高温合金GH2135为基础成分的堆焊覆层。分析了覆层的显微组织、回火抗力和高温抗氧化性能。结果表明,该覆层的显微组织主要由树枝晶γ-Fe(Cr、Ni等)固溶体及晶间α-Fe组成,金属间化合物弥散析出,晶界有少量特殊碳化物,晶粒较细小;与H13钢不同,正交组覆层的硬度随回火温度的升高而增大,700℃高温回火后,正交组中1A覆层的硬度(346 HV0.1)最大。较基础配方覆层10J、H13钢,1A涂层硬度分别提高约50、82 HV0.1,而11K覆层硬度(349 HV0.1)又高于1A覆层,回火抗力最优;11K覆层的抗高温氧化性能优异,其在600、700℃氧化试验的单位面积氧化增重仅为H13钢的1/8、1/3。
Using TIG arc surfacing method, a surfacing coating based on the GH2135 iron-based superalloy was prepared on a Q235 substrate. The microstructure, tempering resistance and high temperature oxidation resistance of the coating were analyzed. The results show that the microstructure of the coating mainly consists of solid solution of dendrite γ-Fe (Cr, Ni) and intergranular α-Fe. The intermetallic compounds are dispersed and precipitated. There are a few special carbides in the grain boundaries, In contrast to H13 steel, the hardness of the overlying group increases with the increase of tempering temperature. After tempering at 700 ℃ for high temperature, the hardness of 1A cladding layer in the orthogonal group is the highest (346 HV0.1). The hardness of 10J, H13 steel and 1A coating increased by about 50,82 HV0.1 respectively compared with that of the base coating, while the hardness of 11K coating (349 HV0.1) was higher than that of 1A coating and the tempering resistance was the best; The high temperature oxidation resistance of the layer is excellent. The oxidation weight gain per unit area of the oxidation test at 600 and 700 ℃ is only 1/8 and 1/3 of the H13 steel.