铸造Fe-C-B耐磨合金增韧研究与进展

新一代耐磨材料Fe-C-B合金具有较高的经济效益和优异的耐磨损性能,但网状硼化物的存在导致其韧性较低,限制了其发展和应用。阐述了Fe-C-B合金B含量优化、高温热处理、合金化、变质处理等增韧方法的研究进展。综合大量研究发现:B含量在2.0%~4.0%范围内时,合金性能较好,硬度可达到60HRC,冲击韧性在6J/cm2左右;在1 000~1 050℃范围内进行高温热处理更利于合金增韧;合金化和变质处理对韧性有一定改善作用。为了进一步提高Fe-C-B合金韧性,需要结合各种增韧方法,深入探讨韧性机制。

Research and Development of the Toughening of Cast Fe-C-B Wear-resistant Alloys

Fe-C-B alloy,with excellent wear resistance and cost-effectiveness,has the potential to become the new generation of wear-resistant materials,whose broad application is limited due to its relatively low toughness caused by meshed boride.The progress of research on Fe-C-B alloy toughening mechanism is reviewed,including adjustment to boron content,heat treatment under high temperature,alloying and modification.It can be suggested that alloys with boron content ranging in 2.0％ —4.0％ has good performance,as the hardness reaches 60HRC and the impact toughness is about 6 J/cm2.High temperature heat treatment at 1 000—1 050 ℃ is favorable for alloy toughening.Also,toughness can be improved to a certain extent through alloying or modification.In-depth studies on the toughening mechanism of Fe-CB alloy are necessary for further improvement of toughness by combining various toughening methods.