变形终止温度对GCr15轴承钢显微组织的影响

doi:10.11868/j.issn.1001-4381.2015.10.005

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摘要

采用MMS300热模拟试验机对GCr15轴承钢的热变形工艺进行模拟,研究变形终止温度对其显微组织的影响。结果表明,变形终止温度在770~870℃内变化时,其显微组织均为片层状珠光体+沿晶界分布的先共析碳化物,并且先共析碳化物周围存在铁素体薄膜。随着变形终止温度的升高,晶粒尺寸和珠光体团的尺寸均增加,珠光体的片层间距略微减小,硬度增加。通过回归分析获得维氏硬度与片层间距倒数的拟合方程HV=38.3S^-1+92.7。变形终止温度在810~870℃内升高时,碳化物的网状程度增加。与810℃相比,变形终止温度为770℃和790℃时,碳化物的网状程度较严重。

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	李振兴
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	张建

关键词 ： GCr15轴承钢, 变形终止温度, 珠光体, 网状碳化物, 片层间距

Abstract：

The hot deformation process of GCr15 bearing steel was simulated by the MMS300 thermal mechanical simulator. The effect of final deformation temperature on microstructure was investigated. The results show that, within the range of 770-870℃,the microstructure of GCr15 bearing steel consists of lamellar pearlite plus proeutectoid carbide which is distributed along the grain boundary and surrounded by ferrite thin film. With the increase of the final deformation temperature,the grain size and pearlite colony size both increase,the mean interlamellar spacing of pearlite decreases slightly and the hardness increases. By means of regression analysis,the fitted curve of Vickers hardness vs the reciprocal of mean interlamellar spacing is given by HV=38.3S^-1+92.7. The degree of carbide network increases when the final deformation temperature increases within the range of 810-870℃. Compared with 810℃,the degree of carbide network is more serious at the final deformation temperature of 770℃ and 790℃.

Key words： GCr15 bearing steel final deformation temperature pearlite carbide network lamellar spacing

收稿日期: 2014-04-11 出版日期: 2015-10-17

基金资助:国家高新技术研究发展计划(863计划)项目(2012AA03A503);国家自然科学基金项目(51174057,51274062);高等学校博士学科点专项科研基金项目(20130042110040)

通讯作者: 李长生 E-mail: lics@ral.neu.edu.cn

作者简介: 李长生(1964-),男,教授,博导,主要从事高品质钢轧制技术研究工作,联系地址:辽宁省沈阳市和平区文化路3巷11号,东北大学105信箱,轧制技术及连轧自动化国家重点实验室(110819),E-mail: lics@ral.neu.edu.cn

引用本文:

李振兴, 李长生, 马永强, 李涛, 张建. 变形终止温度对GCr15轴承钢显微组织的影响[J]. 材料工程, 2015, 43(10): 28-34.
Zhen-xing LI, Zhang-sheng LI, Yong-qiang MA, Tao LI, Jian ZHANG. Effect of Final Deformation Temperature on Microstructure of GCr15 Bearing Steel. Journal of Materials Engineering, 2015, 43(10): 28-34.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.10.005 或 http://jme.biam.ac.cn/CN/Y2015/V43/I10/28

Table 1 GCr15实验钢化学成分(质量分数/%)

Fig.1 热变形实验工艺图

Fig.2 不同变形终止温度下GCr15轴承钢的显微组织
(a)770℃；(b)790℃；(c)810℃；(d)830℃；(e)850℃；(f)870℃

Fig.3 变形终止温度为790℃时试样的透射照片
(a)和图(a)箭头处先共析碳化物的衍射斑(b)

Fig.4 不同变形终止温度下试样的晶粒尺寸和珠光体团尺寸

Fig.5 不同变形终止温度下珠光体的平均片层间距以及硬度值

Fig.6 硬度与片层间距倒数的拟合曲线

Fig.7 不同变形终止温度下的试样深腐蚀后得到的金相图片
(a)770℃；(b)790℃；(c)810℃；(d)830℃；(e)850℃；(f)870℃

Fig.8 GCr15轴承钢不同温度下各平衡相的质量分数

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