Liu Tao, Sun Jibing, Xiao Zhixia, He Jun, Shi Weidong, Cui Chunxiang
Key Laboratory for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, No. 5340 Xiping Road 1, Beichen District, Tianjin 300401, China.
Tianjin Lixinsheng New Material Technology Co., Ltd., Tianjin 301602, China.
Materials (Basel). 2023 Apr 22;16(9):3292. doi: 10.3390/ma16093292.
High chromium cast iron (HCCI) has been widely used as wear-resistant material in the industry. Alloying is an effective way to improve the microstructure and mechanical properties of HCCI. This paper added multi-component V-Fe-Ti-Nb-C-Zr-B alloy (VFC) to HCCI, showing a significant synergistic solution-strengthening effect. The results show that the added V-Ti-Nb-B are dissolved in MC carbide to form the (Cr, Fe, V, Ti, Nb)(C, B) alloy carbide, and a small amount of V and all Zr are dissolved in austenite and martensite. Adding VFC into HCCI improved the hardenability of HCCI, decreased the residual austenite content from 6.0 wt% to 0.9 wt%, increased the martensite content from 70.7 wt% to 82.5 wt%, and changed the structure and content of MC carbide. These changes increased the hardness of as-cast and heat-tread HCCI by 1.4% and 4.1%, increased the hardness of austenite and martensite by 7.9% and 7.0%, increased the impact toughness by 16.9%, and decreased the friction coefficient and wear loss by 2.3 % and 7.0 %, respectively. Thus, the hardness, toughness, wear resistance, and friction resistance of HCCI alloy are improved simultaneously.
高铬铸铁（HCCI）在工业中已被广泛用作耐磨材料。合金化是改善HCCI微观结构和力学性能的有效方法。本文向HCCI中添加了多组分V-Fe-Ti-Nb-C-Zr-B合金（VFC），显示出显著的协同固溶强化效果。结果表明，添加的V-Ti-Nb-B溶解在MC碳化物中形成（Cr, Fe, V, Ti, Nb）（C, B）合金碳化物，少量的V和所有的Zr溶解在奥氏体和马氏体中。向HCCI中添加VFC提高了HCCI的淬透性，使残余奥氏体含量从6.0 wt%降至0.9 wt%，马氏体含量从70.7 wt%增至82.5 wt%，并改变了MC碳化物的结构和含量。这些变化使铸态和热处理态HCCI的硬度分别提高了1.4%和4.1%，奥氏体和马氏体的硬度分别提高了7.9%和7.0%，冲击韧性提高了16.9%，摩擦系数和磨损损失分别降低了2.3%和7.0%。因此，HCCI合金的硬度、韧性、耐磨性和耐摩擦性同时得到了提高。
