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研究了 50钢与Fe V合金复合轧制双层材料CD渗碳层的组织与性能。结果表明 ,热轧态复合界面 50钢一侧由于碳的扩散出现厚度约 50 μm的铁素体区。在随后的CD渗碳过程中 ,铁素体区消失。复合界面两侧组织差异不大。在Fe V合金复合层渗透的情况下 ,自Fe V合金表面经界面至 50钢内部 ,硬度梯度平缓。Fe V合金层在 950℃、1 40 %C碳势下渗碳 5h ,表面无Fe3 C析出 ,淬火后可获得高硬度渗层组织。渗层表面为马氏体基体和弥散的碳化物 ,尺寸为 1 0 0nm左右。Fe 1 69%V合金渗层表面硬度高达 82 5HV ,超过淬火、回火后的Cr1 2MoV钢
The microstructure and properties of the CD carburized layer of 50-steel and FeV alloy-clad rolled double-layer materials were studied. The results show that there is a ferrite region with a thickness of about 50 μm due to carbon diffusion on the hot side of the steel 50. During subsequent CD carburization, the ferrite zone disappears. There is little difference between the two sides of the composite interface. In the case of infiltration of the FeV alloy composite layer, the hardness gradient is gentle from the surface of the FeV alloy through the interface to the interior of the 50 steel. Fe V alloy layer carburized at 950 ℃ and 140% C-carbon potential for 5h, and no Fe3C precipitated on the surface. After quenching, the high hardness layer could be obtained. The surface of the infiltration layer is a matrix of martensite and dispersed carbides with a size of about 100 nm. Fe 1 69% V alloy infiltrated the surface hardness up to 82 5HV, more than quenched and tempered Cr1 2MoV steel