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利用箱式电阻炉研究了加热温度为900,950,1 000,1 050,1 100,1 150℃,保温时间为10,30,60,90 min时大型盾构机用GCr15SiMn轴承钢的奥氏体晶粒长大规律,利用截线法统计奥氏体晶粒尺寸。试验结果表明,随着加热温度提高和保温时间延长,奥氏体晶粒尺寸和长大速率逐渐增大,加热温度的提高比保温时间的延长对奥氏体晶粒长大速率影响更大,奥氏体晶粒迅速长大的加热温度为1 000℃,保温时间为60min。在已有晶粒长大模型的基础上,通过对试验数据进行线性回归,得到了描述GCr15SiMn钢奥氏体晶粒长大规律的数学模型。
The use of box resistance furnace temperature of 900,950,1000,1 050,1 100,1 150 ℃, holding time of 10,30,60,90 min when the large shield machine with GCr15SiMn bearing steel austenitic crystal Grain growth law, the use of cross-sectional statistics of austenite grain size. The experimental results show that with the increase of heating temperature and holding time, the grain size and growth rate of austenite gradually increase, and the increase of heating temperature has a greater influence on the growth rate of austenite grain than the prolongation of holding time. Austenite grain growth rapidly heating temperature of 1 000 ℃, holding time of 60min. Based on the existing grain growth model, a mathematical model describing the regularity of austenite grain growth of GCr15SiMn steel was obtained by linear regression of experimental data.