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材料研究学报  2016, Vol. 30 Issue (8): 595-602    DOI: 10.11901/1005.3093.2015.714
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Si-Mn-Cr-B合金钢的高温变形行为及组织演变研究*
毕金凤, 李祖来, 山泉, 蒋业华, 韦贺, 焦岩
昆明理工大学材料科学与工程学院 昆明 650093
Investigation on High Temperature Deformation Behavior and Microstructure Evolution of Si-Mn-Cr-B Alloy Steel
BI Jinfeng, LI Zulai**, SHAN Quan, JIANG Yehua, WEI He, JIAO Yan
School of Materials Science and Engnineering, Kunming University of Scinece and Technology, Kunming 650093, China
引用本文:

毕金凤, 李祖来, 山泉, 蒋业华, 韦贺, 焦岩. Si-Mn-Cr-B合金钢的高温变形行为及组织演变研究*[J]. 材料研究学报, 2016, 30(8): 595-602.
Jinfeng BI, Zulai LI, Quan SHAN, Yehua JIANG, He WEI, Yan JIAO. Investigation on High Temperature Deformation Behavior and Microstructure Evolution of Si-Mn-Cr-B Alloy Steel[J]. Chinese Journal of Materials Research, 2016, 30(8): 595-602.

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摘要: 

利用Gleeble-1500D热模拟压缩试验机对Si-Mn-Cr-B合金钢进行高温单道次热压缩试验, 研究了不同应变速率(0.01-5 s-1)、不同变形温度(950-1200℃)、50%变形程度条件下的热变形行为, 探索了应变速率和变形温度对应力-应变曲线和微观组织演变的影响, 并在Arrhenius型双曲正弦函数的基础上建立了Si-Mn-Cr-B合金钢的热变形本构方程。结果表明: Si-Mn-Cr-B合金钢高温变形时的峰值应力随应变速率的增大和变形温度的降低而升高, 而高温变形受热激活能过程的控制, 其热变形激活能为Q=372.6 kJ/mol; 材料在变形过程中发生了动态再结晶, 随着温度的升高和应变速率的降低, 动态再结晶晶粒的平均尺寸均呈增大趋势。

关键词 金属材料Si-Mn-Cr-B合金钢热变形组织演变动态再结晶本构方程    
Abstract

The high-temperature single-pass compression test was carried out by utilizing Gleeble-1500D thermal simulation compression testing machine for Si-Mn-Cr-B alloy steel, while its thermal deformation behavior was studied by different strain rate (0.01-5 s-1) in temperature range 950-1200℃ for the same deformation degree i.e. 50%. The influence of strain rate and temperature on the stress - strain curve and microstructure evolution was explored, and the thermal deformation constitutive equation of Si-Mn-Cr-B alloy steel was established on the basis of Arrhenius hyperbolic sine function. The results show that: the peak stress of the high temperature deformation of the Si-Mn-Cr-B alloy steel increases with the increase of strain rate and the decrease of deformation temperature, but high temperature deformation is controlled by thermal activation energy and its thermal activation energy is Q=372.6 kJ/mol; dynamic recrystallization occurs during deformation, and the average size of the dynamically recrystallized grains all shows a trend of increase with the increase of temperature and the decrease of strain rate.

Key wordsmetallic materials    Si-Mn-Cr-B alloy steel    thermal deformation    microstructure materials evolution    dynamicrecry stallization    constitutive equations
收稿日期: 2015-12-08     
基金资助:* 云南省科学技术厅项目619320130010资助
作者简介: 本文联系人: 李祖来,教授
Elements C Si Mn Cr B Fe
Content 0.4 2.0 2.5 0.5~0.75 0.005~0.0075 Bal.
表1  中碳低合金钢的化学成分
图1  Si-Mn-Cr-B合金钢在不同应变速率和不同温度下的真应力-真应变曲线
图2  峰值应力与应变速率的关系曲线
图3  不同应变速率条件下硅锰钢ln[sinh(ασ)]-1/T关系
图4  理论计算流变应力与实测峰值比较
图5  应变速率为5 s-1时不同温度下硅锰钢的显微组织
图6  1100℃时不同应变速率下硅锰钢的显微组织
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