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对10CrMnMo双相钢在不同亚温淬火温度下热处理后的试样进行了显微组织、SEM形貌、显微硬度测试、马氏体含量以及马氏体-铁素体两相的晶粒尺寸分析。结果表明,不同的淬火温度致使马氏体和铁素体的显微形态和分布状况发生变化,淬火温度为720℃时马氏体呈狭长的岛状分布,随着淬火温度的升高,马氏体呈片状与岛状共存,到820℃时板条马氏体与铁素体呈纤维状共存;同时,马氏体体积分数也随之增加,由720℃淬火时的10.41%增加到820℃时的48.19%;马氏体、铁素体的晶粒大小都随着淬火温度的升高而减小,铁素体晶粒尺寸由720℃淬火时的14.23μm减小到820℃时的4.15μm,马氏体尺寸则由5.74μm减小至2.45μm,且不同淬火温度下铁素体晶粒尺寸均大于马氏体晶粒尺寸;双相钢中铁素体组织的显微硬度随着淬火温度的升高而增加,由720℃时的168.21HV1增加至820℃时的235.15HV1;马氏体组织的显微硬度则随淬火温度的升高而降低,由720℃时的713.14HV1降低到820℃时的525.41HV1。
The microstructure, SEM morphology, microhardness test, martensite content and the grain size of martensite-ferrite two phases of 10CrMnMo dual phase steel after heat treatment under different sub-temperature quenching temperature analysis. The results show that the microstructure and distribution of martensite and ferrite change with the different quenching temperature. When the quenching temperature is 720 ℃, the martensite is narrow and island-like distribution. As the quenching temperature increases, The coexistence of flakes and island shape at 820 ℃, martensite and ferrite fiber coexistence of martensite at the same time, the volume fraction of martensite also increases from 10.41% at 720 ℃ quenching to 48.19% at 820 ℃. The grain size of martensite and ferrite decrease with the increase of quenching temperature. The ferrite grain size decreases from 14.23μm at 720 ℃ to 820 ℃ 4.15μm, the size of martensite decreases from 5.74μm to 2.45μm, and the ferrite grain size is greater than the martensite grain size at different quenching temperature. The microhardness of ferrite in dual phase steel The quenching temperature increases and increases from 168.21HV1 at 720 ℃ to 235.15HV1 at 820 ℃. The microhardness of the martensite decreases with the increase of quenching temperature. From 720 ℃ to 713.14HV1 525.41HV1 reduced to 820 ° C.