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利用热浸镀铝后真空扩散的方法在Q235钢板表面制备FeAl合金层,并进行形变量为20.5%、34.1%、40.9%的冷轧试验。采用金相、SEM、EDS、XRD分析了冷轧前后合金层的组织结构,测试了不同冷轧形变量试样的高温抗氧化性能。结果表明,冷轧后合金层与基体结合良好,未出现脆裂、剥落。冷轧过程中剧烈的塑性变形使FeAl相发生部分无序化转变,微观应变随冷轧形变量的增大缓慢增大,最大微观应变达0.40%。冷轧后合金层依然具有良好的高温抗氧化性能,经最大冷轧形变量40.9%时,高温抗氧化性能仅下降8.4%。
The FeAl alloy layer was prepared on the surface of Q235 steel by means of vacuum diffusion after hot-dip aluminizing and the cold rolling tests were carried out with the deformation of 20.5%, 34.1% and 40.9%. The microstructures of the alloy layers before and after cold rolling were analyzed by metallography, SEM, EDS and XRD. The high temperature oxidation resistance of the samples with different cold deformation was tested. The results show that the alloy layer is well bonded with the substrate after cold-rolling without brittle fracture and peeling off. In the cold rolling process, the severe plastic deformation causes partial transformation of the FeAl phase. The micro-strain gradually increases with the increase of cold rolling deformation, and the maximum microscopic strain reaches 0.40%. After cold-rolled alloy layer still has good high temperature oxidation resistance, the maximum cold-rolled deformation of 40.9%, high temperature oxidation resistance decreased by only 8.4%.