SPS制备WC颗粒增强高合金工具钢的组织及力学性能

Microstructure and mechanical properties of tungsten-carbide particulate reinforced high alloy tool steel prepared by spark plasma sintering

采用放电等离子烧结技术(SPS)制备不同WC颗粒含量的HGSF01高合金工具钢。通过扫描电镜、X射线衍射技术等测试手段研究烧结态的组织、物相组成和力学性能,并对试样的弯曲断裂断口进行分析。实验结果表明:随着烧结温度的提高,材料密度不断提高;随着增强颗粒含量的增加,材料的硬度和抗弯性能得到明显提升,但致密度有所下降;烧结态试样的主相是马氏体,同时还伴有残余奥氏体、Cr7C3、VC、Cr2VC2及少量的Mo、Cr碳化物;由弯曲试验的断口分析得知,1 050℃烧结试样的断口形貌特征为多种断裂机制并存。

The particulate reinforced high alloy tool steels with different WC contents were fabricated by spark plasma sintering（SPS）.Scanning electron microscopy and X-ray diffraction analysis were employed to investigate the microstructures and main phase.The fracture morphology and the mechanical properties were also studied.The investigation results show that the density significantly increases with increasing of temperature.The hardness and bending strength increase and the density decreases with increase of the amount of reinforing particles.The main phases of the sample are martensite,retained austenitem,Cr7C3,VC,Cr2VC2 and carbides containing Mo and Cr.According to the bending fracture morphology of the samples sintered at 1 050 ℃,the mechanisms of the fracture are multiple.