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采用重力铸造液-固结合的方法对高速钢复合轧辊结合界面进行了研究,并对切取的小试样进行了完全退火、高温焠火+3次550℃×1 h回火处理。利用金相显微镜、扫描电镜、能谱分析、X射线衍射仪以及显微硬度计对试样进行了金相组织观察、结合面附近合金成分线扫描、组织成分能谱分析、显微硬度测试和X射线衍射相分析。结果表明:在辊芯45号钢表面电磁感应预热到1 270~1 300℃,外层W9Mo3Cr4V高速钢钢液浇铸温度为1 550~1 600℃的情况下,两者之间以熔合扩散方式形成了牢固的冶金结合;在铸态下结合界面宽度为40~50μm,碳及合金元素明显向45号钢侧扩散,通过退火及淬回火处理后,高速钢中的碳及合金元素向45号钢侧进一步扩散,结合界面宽度扩大了100μm左右,45号钢侧得到细片状索氏体组织,高速钢侧为回火马氏体+残余奥氏体+碳化物组织。
The interface of high speed steel composite roll was studied by gravimetric fluid-solid combination method. The small specimens were completely annealed and quenched at high temperature for 3 times and tempered at 550 ℃ for 1 h. The microstructure of the samples was observed by metallographic microscope, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and microhardness tester. Scanning the composition of alloying elements in the vicinity of the interface, the energy spectrum analysis of microstructure and the microhardness test X-ray diffraction phase analysis. The results show that when the electromagnetic induction on the 45 # steel of the roller core is preheated to 1 270 ~ 1 300 ℃ and the casting temperature of the molten steel of W9Mo3Cr4V high speed steel is 1 550 ~ 1 600 ℃, Forming a strong metallurgical bond; in the as-cast state, the interface width is 40 ~ 50μm, the carbon and alloying elements are obviously diffused to the steel side 45, and after annealing and quenching and tempering, the carbon and alloying elements in the high speed steel 45 No. steel side to further spread, with the interface width increased by about 100μm, No. 45 steel obtained fine sorbite, high-speed steel side of the tempered martensite + retained austenite + carbide structure.