Nb对中碳低合金耐磨钢组织和性能的影响  

Effect of Nb on the microstructure and mechanical properties of medium-carbon low-alloy wear-resistant steel

作　　者：耿志达[1,2] 武会宾[1,2] 赵爱民[1,2] 汪小培[1,2] 张岩[1,2] 程俊业[1,2] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]现代交通金属材料与加工技术北京实验室,北京100083

出　　处：《工程科学学报》2015年第7期905-912,共8页Chinese Journal of Engineering

基　　金：国家高技术研究发展计划资助项目(2012AA03A508)

摘　　要：通过光学显微镜、扫描电镜、透射电镜、力学性能测试等手段分析了微量合金元素铌对低合金耐磨钢组织和性能的影响.加入质量分数为0.034%的Nb后,耐磨钢的硬度提高HB 9,-20℃夏比冲击功从29.4 J提高到37.6 J,耐磨性能提高3.5%.硬度和韧性提高的主要原因是组织的细化和析出强化,含Nb钢在奥氏体化过程中析出纳米级的细小Nb C第二相,并且钉扎奥氏体晶界,抑制晶粒的长大,钉扎类型符合Zener模型,但不同于之前研究者所得的比例系数.The effect of Nb on the microstructure and mechanical properties of low-alloy wear-resistant steel was analyzed by optical microscopy,scanning electron microscopy,transmission electron microscopy and mechanical property test. By adding 0. 034% Nb in low-alloy wear-resistant steel,the hardness increases by HB 9,the Charpy impact energy soars to 37. 6 J from 29. 4 J at- 20 ℃ and the anti-wear performance improves by 3. 5%. Microstructure refinement and precipitation strengthening are main reasons for the improvement of hardness and impact toughness. Nano-sized particles of Nb C in the Nb-bearing steel precipitate in the process of austenization,pin the austenite grain boundaries and inhibit the growth of austenite grains. This pining type is in accordance with the Zener model,but different from precedent research.

关 键 词：耐磨钢 铌 微合金化 晶粒细化 抗磨损性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]