【摘要】：利用熱重分析、金相及掃描分析等手段,研究了加熱溫度、保溫時間和加熱爐內(nèi)氣氛對高碳鉻軸承鋼GCr15氧化和脫碳行為影響。結(jié)果表明:隨著加熱溫度和保溫時間增加,GCr15鋼氧化鐵皮厚度和脫碳層深度均呈增大趨勢;隨著爐內(nèi)含氧量增加,氧化鐵皮厚度也呈增大趨勢,但脫碳層深度呈下降趨勢,且含氧量達(dá)6%脫碳趨于穩(wěn)定。通過熱力學(xué)和動力學(xué)分析發(fā)現(xiàn):隨著加熱溫度、保溫時間以及爐內(nèi)含氧量增大,其對應(yīng)的拋物線氧化速率常數(shù)不斷增大、高溫抗氧化能力增強(qiáng)。低于900℃時,GCr15鋼氧化增重與時間呈直線規(guī)律增長;高于900℃時,呈拋物線規(guī)律增長,其對應(yīng)的氧化激活能由113.9 k J/mol增大到324.1 k J/mol,870℃為氧化機(jī)制發(fā)生改變的臨界溫度。
[Abstract]:The effects of heating temperature, holding time and atmosphere in heating furnace on GCr15 oxidation and decarbonization behavior of high carbon chromium bearing steel were studied by means of thermogravimetric analysis, metallographic analysis and scanning analysis. The results show that the thickness of iron oxide scale and the depth of decarbonization layer of GCr15 steel increase with the increase of heating temperature and holding time. With the increase of oxygen content in the furnace, the thickness of iron oxide scale also increases, but the depth of decarbonization layer decreases, and the decarbonization tends to be stable when the oxygen content reaches 6%. Through thermodynamic and kinetic analysis, it is found that with the increase of heating temperature, holding time and oxygen content in the furnace, the corresponding parabola oxidation rate constant increases and the oxidation resistance at high temperature increases. When the temperature is lower than 900 鈩，

本文編號：2488304