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选用不同Al含量配比的渗铝剂,对N80套管钢进行包埋渗铝处理,形成渗铝层。阐述了包埋渗铝过程,并依次表征了不同Al含量渗剂所得渗铝层的金相组织、元素分布、物相组成和显微硬度。结果表明:采用不同Al含量的渗剂在950℃真空条件下可以在N80钢基体表面获得450～650μm厚度连续的渗铝层组织;渗铝层厚度随渗剂中Al含量增加而增厚;渗层组织从表面向基体方向Al含量呈梯度减少;渗剂中Al含量的不同引起渗层的物相变化,10%和20%Al含量的渗剂所得渗层组织为Fe3Al相,35%Al含量的渗剂所得渗层组织为FeAl相;不同Al含量渗剂下所得渗铝试样渗层组织的显微硬度均高于基体,从渗层表面向基体方向延伸,显微硬度逐渐降低趋于平缓。
The aluminizing agent with different content of Al was selected to embed and aluminize N80 casing steel to form aluminized layer. The aluminizing process was described, and the microstructure, elemental distribution, phase composition and microhardness of the aluminized layer obtained from different Al infiltration agents were characterized in turn. The results show that continuous aluminizing layer with thickness of 450 ~ 650μm can be obtained on the surface of N80 steel under 950 ℃ vacuum condition. The thickness of aluminizing layer increases with the increase of Al content in the infiltrating agent. The Al content in the layer decreases from the surface to the base. The Al content in the infiltrant causes the phase change of the layer. The infiltrated layer obtained from the infiltrant with 10% and 20% Al is the Fe3Al phase and the 35% Al content Of the infiltrant obtained infiltrated tissue FeAl phase; different Al infiltrated material infiltrated sample infiltrated tissue microhardness were higher than the substrate, extending from the surface of the infiltration layer to the direction of the matrix, the microhardness gradually decreased to gentle.