摘要
研究了碳质量分数分别为0.26%,0.33%和0.42%的三种含钒微合金钢在600,550,500和450℃下等温处理时碳对晶内铁素体形成的影响,测量了不同等温温度处理后钢的维氏硬度、500℃下晶界和晶内铁素体的纳米硬度,并探讨了晶内铁素体的形核位置.结果表明:在相同温度下等温处理时,随着钢中碳含量的增高,钢中非共析铁素体的含量降低,铁素体晶粒的尺寸减小,钢的硬度升高.在500℃等温处理后,晶界铁素体的纳米硬度远高于晶内铁素体的纳米硬度;且随着碳含量的增高,晶界和晶内铁素体的纳米硬度都随之升高,但各实验钢中晶内铁素体的纳米硬度相差不大.适当的夹杂物和先析出晶内铁素体都可以作为形核位置诱导晶内铁素体析出.
Three medium-carbon vanadium-microalloyed steels were designed and experimentally prepared, with carbon contents of 0.26 %, 0.34 % and 0.42 %. The effect of carbon content on the formation of intragranular ferrite （IGF） in the steels isothermally treated at 600, 550, 500 and 450 ℃ were studied. Vickers hardness test was carried out for the steels isothermally treated at different temperatures. The nano-hardness of grain boundary ferrite （GBF） and IGF was also measured. Nucleation sites of IGF were then discussed. The results showed that the amount of non-eutectoid ferrite increased, the grain size of ferrite decreased, and the hardness was enhanced with increasing carbon content, if isothermally treated at the same temperature. In samples isothermally treated at 500 ℃, the nano-hardness of GBF was found higher than that of IGF. The nano-hardness of both GBF and IGF increased with the increase of carbon content, but IGF＇s varied little. It was also found that appropriate inclusions and pre-nucleated IGF could be nucleation sites of IGF.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2008年第9期997-1001,1028,共6页
Journal of University of Science and Technology Beijing
基金
钒国际技术委员会(VANITEC)
国家自然科学基金资助项目(No.50271009)
关键词
钒微合金钢
晶内铁素体
等温处理
形核位置
vanadium-microalloyed steel
intragranular ferrite
isothermal treatment
nucleation site
