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通过包覆浇铸+热轧变形工艺,制备了Q235/CrWMn钢复合刀具材料,并用扫描电子显微镜(SEM)和维氏硬度仪分析了复合材料的界面组织、成分和性能的变化规律.实验结果表明,通过真空冶炼浇铸以及变形量超过90%的热轧工艺,可以实现两种组元金属材料之间的冶金结合,其中Cr、W等元素的过渡层宽度仅为10～40μm.随后的热处理研究发现,复合材料在830±5℃保温后空冷或者油淬时,Q235一侧为珠光体+铁素体组织,CrWMn一侧为马氏体组织,其硬度可达600～750HV,使复合刀具材料同时具有较好的韧性和强度.
The Q235 / CrWMn steel composite tool material was prepared by clad casting + hot rolling deformation process, and the change law of interfacial microstructure, composition and properties of the Q235 / CrWMn steel was analyzed by scanning electron microscopy (SEM) and Vickers hardness tester. , The metallurgical bond between the two component metallic materials can be achieved by vacuum smelting and casting and a hot rolling process with a deformation of over 90%, where the transitional layer widths of Cr, W and other elements are only 10 to 40 μm. Subsequent heat treatment studies It is found that when the composite is air-cooled or oil-quenched at 830 ± 5 ° C, the side of Q235 is pearlite + ferrite and the side of CrWMn is martensite with a hardness of 600-750HV. The composite tool material At the same time has good toughness and strength.