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Development of Low Carbon Microalloyed Ultra High Strength Steels

机译:低碳微合金超高强度钢的发展

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摘要

In the present study HSLA steels of varying carbon concentrations, alloyed with Mn, Ni, Cr, Mo, Cu and micro-alloyed with Nb and Ti were subjected to different finish rolling temperatures from 850℃ to 750℃ in steps of 50℃. The microstructure of the steel predominantly shows martensite. Fine twins, strain induced precipitates in the martensite lath along with ε-Cu precipitates are observed in the microstructure. With an increase in carbon content the strength value increases from 1200MPa UTS to 1700MPa UTS with a negligible reduction in elongation. Impact toughness values of 20-26 joules at room temperature and -40℃ were obtained in sub-size samples.
机译:在本研究中,碳含量不同的HSLA钢与Mn,Ni,Cr,Mo,Cu合金化以及与Nb和Ti微合金化,以850℃至750℃的不同终轧温度以50℃的步幅进行。钢的显微组织主要显示马氏体。在组织中观察到细双胞胎,马氏体板条中的应变诱导沉淀以及ε-Cu沉淀。随着碳含量的增加,强度值从1200MPa UTS增加到1700MPa UTS,而伸长率的降低可忽略不计。在小尺寸样品中,室温和-40℃时的冲击韧性值为20-26焦耳。

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