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60 min。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。
Abstract
The GCr15SiMn bearing steel apply to large-scale shield tunneling machine was heated in an electric furnace at the temperature of 900, 950, 1 000, 1 050, 1 100, 1 150 ℃, and holding time of 10, 30, 60, 90 min to investigate austenite grain growth behavior. The grain size of austenite was measured by using linear intercept method on Image-tool software. The experimental results show that grain size and growth rate of austenite increases with the increasing of heating temperature and holding time. The increasing of heating temperature has a larger influence on the grain growth rate than the increasing of holding time. When the heating temperature is 1 000 ℃ and holding time is 60 min, the austenite grains grow up quickly. On the basis of previous models and experimental results, a mathematical model for austenite grain growth of GCr15SiMn steel is obtained using regression analysis which is.
关键词
盾构机轴承 /
奥氏体 /
晶粒长大 /
数学模型
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参考文献
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脚注
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基金
重大装备用轴承钢关键技术开发（863计划）
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