热处理对1.41%C超细晶超高碳钢马氏体亚结构的影响

Effect of Heat Treatment on Martensite Sub-structure of 1.41%C Ultra-fine Grained Ultra-high Carbon Steel

1.41%C超高碳钢控轧后进行超细球化预处理,并在不同的温度下进行二次淬火。组织观察表明:热轧并球化预处理后超高碳钢获得了超细球化组织,经淬火后获得超细马氏体组织。随淬火温度升高,马氏体逐渐粗化,马氏体亚结构中位错对孪晶的比例先升后降,890℃时获得完全位错亚结构。并提出1.41%C超高碳钢获得大量板条马氏体的淬火温度为860～890℃。

Ultra-fine spheroidizing pretreatment technology was applied to the 1.41%C hot-rolling ultra-high carbon steel. Then the second quenching was carried out at different temperature. Observation results show that the ultra-fine spheroidizing microstructure is obtained by spheroidizing pretreatment after hot-rolling treatment, and ultra-fine martensite is formed after quenching. Martensite is getting coarser and the proportion of dislocation to twin is＂ up first and down later with quenching temperature rising. Full dislocation sub-structure is obtained by quenching temperature of 890℃. At the same time, 1.41%C ultra-high carbon steel obtains a great deal of lath martensite at the quenching temperature range of 860-890℃.