包覆浇铸和热轧工艺制备Q235/CrWMn刀具材料

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.

Preparation of Q235/CrWMn cutting tool material by composite casting and hot rolling

A composite cutting tool material,consisting of Q235 and CrWMn steel,was prepared by composite casting and hot rolling process. Through vacuum melting and casting,followed by hot rolling deformation with a relative reduction larger than 90%,excellent metallurgical bonding between the component materials was obtained,with an interface layer of only 10 to 40 μm wide. Heat treatment experiments with different cooling modes were carried out. The results showed that after air cooling or oil quenching,a mixture microstructure of ferrite and pearlite in Q235 was formed. While in the side of CrWMn,a martensite structure with a micro hardness of 600 to 750 HV was found. The composite material exhibits the excellent comprehensive mechanical properties of both high toughness and strength.