热处理对变质高硼铸钢组织和性能的影响  

Effect of Heat Treatment on the Microstructures and Properties of Modified High Boron Cast Steel

作　　者：吴占文[1] 符寒光[2] 马一民[1] 李鹏军[1] 

机构地区：[1]武警工程学院基础部,陕西西安710086 [2]清华大学机械工程系,北京100084

出　　处：《铸造技术》2006年第12期1307-1310,共4页Foundry Technology

基　　金：论文获中国博士后基金(2004036058);河南省教育厅自然科学基金(2006430014)资助

摘　　要：研究了淬火温度对稀土-钛复合变质高硼铸钢显微组织和力学性能的影响。结果发现,在碳钢中加入适量硼并经稀土-钛变质处理后,获得了高硬度硼化物加铁素体、珠光体和马氏体组成的复合组织。随着淬火温度升高,金属基体由铁素体、珠光体和马氏体的复合组织向单一马氏体组织转化,硼化物由连续状向孤立状分布转化,且硼化物呈现粗化趋势。随着淬火温度提高,变质高硼铸钢的硬度和冲击韧度均提高,超过1 000℃,硬度和冲击韧度变化不明显。变质高硼铸钢在1 000℃左右淬火获得单一马氏体和孤立分布的硼化物,具有良好的耐磨性。The effect of quenching temperature on the microstructures and properties of high boron cast steel modified with rare earth and titanium has been investigated. The results show that the solidification structures of cast steel consists of high hardness boride, ferrite, pearlite and a small quantity of martenisite that is fabricated by adding a suitable boron element in the low carbon steel and modification with rare earth and titanium. The metallic matrix of modified high boron cast steel changes into the single martensite from the composite structures of ferrite, pearlite and martenisite along with the increase of quenching temperature. The increase in quenching temperature also leads to the transformation of boride from continuous shape to isolated shape and promotes the coarsening of boride. Moreover, when quenching temperature is increased, the hardness and impact toughness of high boron cast steel are increased also. The hardness and impact toughness have no obvious change while exceeding 1 000 ℃. High boron cast steel quenching at 1 000 ℃ consists of single martensite and isolated boride and has excellent wear resistance.

关 键 词：高硼铸钢 变质处理 淬火处理 力学性能 耐磨性 

分 类 号：TG113[金属学及工艺—物理冶金]