热处理对Fe-B-C合金显微组织和性能的影响

Effect of Heat Treatment on Microstructures and Properties of Fe-B-C Alloy

摘要:

研究含1.4%~2.0%B和0.4%~0.6%C的Fe-B-C合金凝固过程和凝固组织以及不同淬火加热温度下的显微组织、力学性能和耐磨性的变化规律。结果表明，Fe-B-C合金凝固组织由Fe2B、Fe3(C, B)和Fe23(C, B)6等硼化物及马氏体、珠光体和铁素体等金属基体组成。淬火后硼化物局部断网且无硼化物新相出现，基体全部转变成马氏体，硬度大于55 HRC。随淬火温度升高，Fe-B-C合金硬度增加，冲击韧性变化不明显。Fe-B-C合金在静载销盘磨损和动载冲击磨损条件下，都具有优异的耐磨性，且淬火温度变化对耐磨性无明显影响

Abstract:

The solidification process and solidification structures of Fe-B-C alloy containing 1.4%-2.0% B and 0.4%-0.6% C were researched. The change of microstructures, mechanical properties and wear resistance of the alloy at different quenching temperatures were also studied. The results show that the solidification structures of Fe-B-C alloy consist of borides such as Fe2B, Fe3(C, B) and Fe23(C,B)6 and metallic matrix such as martensite, pearlite and ferrite. The part of boride network is broken and there is no new phase after quenching. The matrix transforms into the single martensite completely and the hardness exceeds 55 HRC. The hardness of Fe-B-C alloy increases while the impact toughness has no obvious change with increase of the quenching temperature. Under the conditions of static load pin-on-disc wear and dynamic load impact wear, Fe-B-C alloy has excellent wear resistance and the quenching temperature has no marked effect on the wear resistance