2％残氧气氛下化学成分对高碳钢脱碳层深度的影响

Effect of Chemical Composition on Decarburization Depth of High Carbon Steel under 2 % Residual Oxygen Atmosphere

利用同步热分析仪研究了2％残氧气氛下化学成分对高碳钢脱碳层深度的影响。试验结果表明，化学成分从碳扩散系数、脱碳边界的碳比值和氧化层深度等方面影响总脱碳层深度。其中，铬显著降低了碳扩散系数，硅对碳扩散系数的影响不明显；碳和铬显著降低脱碳边界的碳比值，硅影响不明显；硅在1150℃以下时可明显降低氧化层深度，而在1150℃以上时则明显加深氧化层深度，其他元素对氧化层深度的影响不明显。各钢种的脱碳层深度从深到浅排序为60Si2Mn、92A和GCr15。

The effects of chemical composition on decarburization depth of high carbon steel under 2% residual oxygen atmosphere were studied by using Synchronous Thermal Analyzer. The results showed that chemical composition affected the total deearburization depth from aspects including the carbon diffusion coefficient, the ratio of carbon content at decarburization boundary to matrix carbon content, and the thickness of oxide scale. With the increase of Cr, the carbon diffusion coefficient was reduced significantly, while the effect of Si was not obvious. With the increase of C and Cr, the ratio of carbon content at decarburization boundary to matrix carbon content was reduced significantly, while the effect of Si was not obvious. With the increase of Si, the thickness of oxide scale was reduced greatly when the heating temperature was below 1 150 ℃, and the thickness of oxide scale was increased greatly when the heating temperature was above 1 150 ℃ , while the effects of other elements were not obvious. Under the same heating condition, the decarburization depth of 60Si2MnA, 92A and GCrl5 were in descending order.