热处理对高硼低碳铸钢显微组织和性能的影响

Effect of Heat Treatment on Microstructure and Property of High Boron and Low Carbon Cast Steel

在含碳量小于0.2%的低碳铸钢中加入1.0%B,获得了高强度高硼耐磨铸钢,并研究了淬火温度对高硼铸钢显微组织和性能的影响。结果显示,在900～1050℃内淬火,均可获得单一的马氏体组织,淬火温度的变化对硬度影响不明显。随着淬火温度提高,硼化物由连续网状分布变成断网状分布,导致冲击韧性提高;淬火温度超过1000℃后,冲击韧性变化不明显。另外,在900～1050℃内淬火,高硼铸钢均具有优良的耐磨性。

A high boron cast steel with high strength and wear-resistant is obtained by adding 1.0 % B to the low carbon steel whose carbon content is 〈 0.2 %. The effect of quenching temperature on the micmstmctures and properties of high boron cast steel is investigated. The results show that the unitary martensite matrix can be obtained by quenching at 900 - 1 050 ℃, and the hardness of high boron cast steel has no obvious change when the quenching temperature is changed. With the rising of quenching temperature, the boride transforms from continuous networked into broken network, and the impact toughness of high boron cast steel increases. After the quenching temperature being above 1 000 ℃, the impact toughness has no obvious change. Moreover, high boron cast steel has excellent wear resistance quenching at 900 - 1 050 ℃.