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利用同步热分析仪研究了2%(体积分数)残氧气氛下C、Si、Cr对高碳钢脱碳层深度的影响。结果表明:化学成分从以下方面影响总脱碳层深度:碳扩散系数、脱碳边界的碳比值、氧化层深度。Cr元素显著降低了碳扩散系数,Si元素对碳扩散系数影响不明显。C、Cr等元素显著降低脱碳边界的碳比值,Si元素影响不明显。Si在1150℃以上则明显加深氧化层深度,从而导致了60Si2MnA钢脱碳层深度降低。在相同的条件下,以上三个因素的综合作用使得GCr15、92A、60Si2MnA钢的脱碳层深度逐渐增加。
The influence of C, Si and Cr in 2% (volume fraction) residual oxygen on the depth of decarburization of high carbon steel was studied by synchronous thermal analyzer. The results show that the chemical composition affects the total depth of decarburization in terms of the carbon diffusion coefficient, the carbon ratio at the decarburization boundary, and the depth of the oxide layer. Cr element significantly reduces the carbon diffusion coefficient, Si element has little effect on the carbon diffusion coefficient. Elements such as C and Cr significantly reduce the carbon ratio at the decarburization boundary, and the effect of Si element is not obvious. Si at 1150 ℃ or more significantly deepened the depth of the oxide layer, resulting in 60Si2MnA steel decarburization depth decreased. Under the same conditions, the depth of decarburization of GCr15, 92A and 60Si2MnA steels increased with the combination of the above three factors.