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利用放电等离子烧结技术(SPS)研究了M42粉末高速钢/45钢双金属连接技术,分析了连接接头的界面形貌,测试了连接接头的界面结合强度。结果表明:在970℃×10min×70MPa烧结工艺下,可一次性实现M42粉末高速钢的烧结及其与45钢的连接;接头的M42粉末冶金高速钢部分,显微组织均匀,碳化物细小、无偏析,经工艺1180℃×5min×550℃×1h热处理后,硬度达到67.36HRC;M42/45钢连接接头组织致密且均匀,界面两侧有元素扩散,属冶金结合,界面结合强度可达到550MPa。
The bimetallic connection technology of M42 powder high-speed steel / 45 steel was studied by spark plasma sintering technology (SPS). The interface morphology of the connector was analyzed and the interfacial bonding strength of the connector was tested. The results show that the sintering of M42 powder high-speed steel and its connection with 45 steel can be realized once at 970 ℃ × 10min × 70MPa sintering process. The part of M42 powder metallurgy high-speed steel joint has uniform microstructure and small carbide, Without segregation, the hardness reaches 67.36HRC after the heat treatment at 1180 ℃ × 5min × 550 ℃ × 1h. The joints of M42 / 45 steel are dense and uniform, and the elements diffuse on both sides of the interface, which belongs to metallurgical bonding and the interface bonding strength can reach 550MPa .