摘要
为提高普通碳钢的耐磨性,在低碳钢的原材料中加入3.0%~3.5%B。金相显微组织观察和XRD分析结果表明:获得的高硼低碳铸造合金铸态组织为铁素体+珠光体+Fe2B。Fe2B呈连续网状沿晶界分布,铁素体呈不规则块状分布在硼化物周围,珠光体呈片层状分布在硼化物和铁素体之间。经980℃×2 h+250℃×4 h淬回火热处理后,铁素体和珠光体全部转变为强韧性均好的板条马氏体组织,Fe2B局部出现断网现象,仍呈网状分布。铸造合金综合力学性能显著提高,经测试,其硬度≥HRC60.2,冲击韧性≥12.5 J/cm2,耐磨性相对40Gr钢提高了2.5倍,可作为优良的耐磨金属材料推广应用。
In order to improve the wear resistance of ordinary carbon steel, 3.0%-3.5%B was added in the raw materials of low carbon steel. The microstructure and the XRD analysis shows that the microstructure of as cast alloy consists of ferrite, pearlite and Fe2 B. Fe2 B forms continuous reticulation and distributes along the grain boundary, ferrite is irregular block, distributes in the boride around, a lamellar pearlite distributes in middle of the boride and ferrite. After 980℃×2 h+250℃×4 h quenching and tempering heat treatment, ferrite and pearlite all change to lath martensite with good strength and toughness. The local reticular structure of Fe2 B was break,but still form mesh distribution. After the test, the hardness of casting alloy is HRC≥60.2, impact toughness≥12.5 J/cm2, the wear resistance is increased by 2.5 times compared with 40 Gr steel. It can be applied as the metal material with excellent wear resistance.
出处
《铸造》
CAS
CSCD
北大核心
2014年第12期1273-1276,共4页
Foundry
