高线轧制用硬质合金辊环材料的组织与性能

Microstructure and Performance of Carbide Roll for High-speed Wire Mill

硬质合金辊环材料的组织与性能对钢厂制定配辊方案具有很大的参考价值。本文分析了硬质合金辊环材料的组织和性能特点。其组织与性能由材料中粘结相的含量和WC晶粒大小决定,采用粗晶WC为原料,合金的断裂韧性可达18MPa·m1/2以上,合金的WC晶粒度可达4～5μm,导热率为85～110W/(m·K);减少合金WC/WC界面和WC/Co界面以及WC颗粒的聚集区,可有效地减少热疲劳裂纹源的存在数量,能在一定范围内改善合金韧性和提高合金的抗疲劳性能;合金的磨损性能与粘结相含量、WC晶粒分布和尺寸有很大关系。从WC原料的选择、WC形貌、合金结构和功能材料的应用等方面综述了辊环材料的研究进展,提出了今后研究应重点关注动平衡检测技术在高速轧制技术中的应用、利用计算机对轧制过程中辊环的温度场和应力场进行模拟及磨损机理等方面。

The microstructure and performance of carbide roll material have great reference value for steel mill in roll selecting scheme. The microstructure and performance characteristics of the carbide roll material, which are determined by binder phase content and WC grain size in the alloy, are analyzed. When coarse grain WC powder was taken as raw material, the fracture toughness of the alloy can reach 18 MPa·m^1/2 and higher, the WC grain size can reach 4-5 μm, the thermal conductivity can reach 85-110 W/（m·K）. By reducing the interface quantities of WC/WC and WC/Co and decreasing particle aggregation of WC, the quantities of thermal fatigue crack source are effectively decreased, the fracture toughness and anti-fatigue performance are improved. The wear performance is related to the binder phase content, grain size and distribution of WC. Finally, the research progress on roll material, which mainly focuses on the choice of WC raw material, WC morphology, alloy structure and application of function materials, is summarized. Future research should focus on th.e application of dynamic balance test technology in high-speed rolling technology, simulation of temperature field and stress field in rolling process and wear mechanism, etc.