论文部分内容阅读
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.
The effect of carbon on the formation of intragranular ferrite during the isothermal treatment at 600, 550, 500 and 450 ℃ of three vanadium-bearing microalloyed steels with carbon mass fraction of 0.26%, 0.33% and 0.42% was studied. The effects of different isothermal temperature treatments The Vickers hardness of the steel, the grain boundary and the nano-hardness of the ferrite in the crystal at 500 ℃, and the nucleation position of the intragranular ferrite is discussed.The results show that with the isothermal treatment at the same temperature, The content of non-eutectoid ferrite in steel decreases, the size of ferrite grain decreases, and the hardness of steel increases.When isothermal treatment at 500 ℃, the grain boundary ferrite nano-hardness is much higher than The nanohardness of the ferrite in the crystal; and with the increase of the carbon content, the grain boundary and the intragranular ferrite nanohardness are increased, but the nano-hardness of the intragranular ferrite in each experimental steel is not big difference Appropriate inclusions and precipitated intragranular ferrite can all act as nucleation sites to induce intragranular ferrite precipitation.