新型高强韧Cr-Ni-Mo-V钢的显微组织结构与强韧化机理

Microstructure and strengthening-toughening mechanism of new high strength and toughness Cr-Ni-Mo-V steel

新型高强韧Cr-Ni-Mo-V钢以新的设计思想为指导,采用"减法合金"和氧化物控制理论,减少易氧化元素、提高主元素,从而有效提高钢的强韧性。对新型高强韧钢在不同氧含量下钢中夹杂物以及显微组织结构进行分析,研究该高强韧钢的强韧化机理。结果表明:采用减法合金和氧化物设计方法,可以提高新型钢的纯净度,增强钢的韧性;新型高强韧钢中存在纳米级M2C、VC等碳化物析出,大量位错在晶界、马氏体板条间增值和堆积,使钢兼具高强度和韧性。

Based on ＂subtraction ＇alloy＂ and oxide control theory, the easily oxidized elements was reduced and the content of main elements was increase. The new high strength and toughness Cr-Ni-Mo-V steel was designed to improve the strength and toughness of steel. Inclusion and microstl＇UCture of new high strength and toughness steel with different oxygen content were analyzed, and the strengthening-toughening mechanism was studied. Tile results shows that the new steel with high toughness resulting from high purity can be produced by adopting subtraction alloy design. The nanoscale M2C and VC were precipitated in new steel, and a large amount of dislocations multiplicate and accumulate in grain boundary and between Lath martensite, which improves the strength and toughness of steel simultaneously.