热处理对Fe-B-C合金组织和力学性能影响  

Effect of Heat Treatment on Microstructure and Mechanical Properties of Cast Fe-B-C Alloy

作　　者：冯锡兰[1] 蒋志强[1] 符寒光[2] 

机构地区：[1]郑州航空工业管理学院机电工程系,郑州450015 [2]清华大学机械工程系,北京100084

出　　处：《航空材料学报》2007年第5期26-29,共4页Journal of Aeronautical Materials

基　　金：河南省科技攻关计划(0624250005;0624260011);中国博士后科学基金(2004036058)资助

摘　　要：研究了淬火温度和冷却速度对B含量〉1.0%和C含量〈0.2%的Fe-B-C铸造合金组织和性能的影响。结果发现：相同淬火温度下,随着淬火冷却速度增加,淬火组织不断发生变化,由大量珠光体＋铁素体＋少量马氏体→大量马氏体＋少量珠光体→马氏体,合金硬度也不断增加。水冷淬火条件下,淬火温度过低或过高,均不利于获得单一的马氏体基体组织。Fe-B-C合金在950-1000℃水冷淬火后,可以获得细小板条马氏体基体上分布高硬度硼化物的复合组织,硬度大于55HRC,冲击韧性大于15 J/cm^2,综合力学性能优良。Effect of quenching temperature and cooling rate on the structure and properties of cast Fe-B-C alloy containing more than 1.0% B and lower than 0.2% C has been studied. The results show that the structure of Fe-B-C cast alloy changes from pearlite being prevailing ＋ ferrite ＋ a small amount of martensite to martensite being prevailing ＋ a small amount of pearlite and to martensite matrix, and the hardness increases with the increasing of quenching cooling rate. In the case of water quenching, higher or lower quenching temperature is not advantageous to obtain full martensite. Quenching at 950 - 1000℃ , cast Fe-B-C alloy could obtain the structure of fine lath martensite and boride with high hardness. The hardness and impact toughness of cast Fe-B-C alloy exceed 55HRC and 15J/ cm^2 respectively.

关 键 词：Fe-B-C合金 淬火温度 冷却速度 硬度 硼化物 

分 类 号：TG162.9[金属学及工艺—热处理]