将空淬过的高铬白口铸铁经-196 ℃深冷处理后在不同温度下回火,研究了深冷处理对该铸铁硬度、冲击韧度、滑动磨损、滚筒式磨损和金相组织等的影响.结果表明:经深冷处理后,其硬度有较大幅度提高,但冲击韧度略有下降;深冷处理后再经250 ℃回火,可以获得较好的硬度和韧性的配合;经深冷处理后再回火的硬度峰值比未经深冷处理的提前了约100 ℃;深冷处理对耐磨性影响不明显.

A quenched high-chromium cast iron was cryogenically treated at -196 ℃ and than tempered at various temperatures.The influences of the cryogenic treatment on hardness,impact toughness,sliding wear,rolling wear and microstructrue of the iron were studied.The cryogenic treatment improved the hardness of the high-chromiun cast iron greatly,but decreased the impact toughness.The best integral performance was obtained when the high-chromiun cast iron was tempered at 250 ℃ after cryogenic treatment.The hardness of the cryogenically treated iron reached its peak value when the iron was tempered at the temperature 100 ℃ lower than the temperature corresponding to the iron without cryogenic treatment.The cryogenic treatment had litter impact on the wear-resistant ability of the high-chromiun cast iron.