CAJ | 학술논문

采用镶铸法，以液固结合的方式制备了高碳钒系高速钢/结构钢双金属复合材料。研究了不同结合条件下，双金属复合材料界面结构及形态。试验结果表明，镶铸是靠外层合金带入的过热热量来获得界面结合的，当外材与芯材在体积比大于8.0的条件下，才有可能获得界面结合，其界面结合为扩散结合。复合材料界面结构由芯材扩散层、激冷凝固层、方向性生长层和胞状晶粒层组成。外层材料凝固时有明显的方向性生长，其液固相线推移速度对在液固结合条件下外层材料的凝固组织具有明显影响。当外材与芯材体积比为1.25时，外层材料的凝固速度最快，出现了棒状伪共晶组织，随体积比的增长，凝固组织表现为沿径向传热方向拉长的胞状晶粒。
채용양주법，이액고결합적방식제비료고탄범계고속강/결구강쌍금속복합재료。연구료불동결합조건하，쌍금속복합재료계면결구급형태。시험결과표명，양주시고외층합금대입적과열열량래획득계면결합적，당외재여심재재체적비대우8.0적조건하，재유가능획득계면결합，기계면결합위확산결합。복합재료계면결 구유심재확산층、격냉응고층、방향성생장층화포상정립층조성。외층재료응고시유 명현적방향성생장，기액고상선추이속도대재액고결합조건하외 층재료적응고조직구유명현영향。당외재여심재체적비위1.25시，외층재료적응고 속도최쾌，출현료봉상위공정조직，수체적비적증장，응고조직표현위연경향전열방향랍장 적포상정립。
High carbon vanadium alloyed high-speed steel/str uctural steel series bimetal composite was prepared through liquid-solid bonding by cas t-in insertion. The microstructure and morphology of interface of bimetal composite were studied under different bonding conditions. The results show that interface bonding is depende nt on superheated outer layer alloys in cast-in insertion. It is possible to obtain interface bonding in volume ratio of outer/core materials greater than 8. 0, and the bonding mechanism is diffusion bonding. The interface structure of co mposite consists of core material diffusion layer, chilling solidified layer, directional growth layer, and cellular granular layer. The apparent directional growth is found during solidification process of outer material.The advanced velocity of liquidus-solidus has obviously effect on solidificat ion structure of outer material. With 1.25 volume ratio of outer/core material, the fastest solidification velocity of outer material exhibits the rod-like pseudo-e utectic microstructure in composite. HSS solidification microstructure changes into prolonged cellular grain along the radial heat transfer direction with the increase of volume ration.