| 连续退火的无Si TRIP钢的组织和力学性能 |
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| 引用本文： | 定巍, 龚志华, 唐荻, 江海涛, 王宝峰. 连续退火的无Si TRIP钢的组织和力学性能[J]. 工程科学学报, 2013, 35(3): 319-324. DOI: 10.13374/j.issn1001-053x.2013.03.008 |
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| 作者姓名： | 定巍 龚志华 唐荻 江海涛 王宝峰 |
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| 作者单位： | 1. 内蒙古科技大学材料与冶金学院, 包头 014010; |
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| 基金项目： | 国家自然科学基金资助项目(50804005) |
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| 摘 要： | 在实验室用Gleeble3500热模拟试验机制备了一种无Si TRIP钢.利用拉伸试验机、扫描电镜、透射电镜、X射线衍射以及热膨胀仪对其力学性能、微观组织和相变规律进行研究,在此基础上分析了贝氏体相变温度和时间对力学性能和残余奥氏体的影响.无Si TRIP钢呈现出良好的整体力学性能,抗拉强度分布在740~810 MPa,延伸率均在25%以上,最高可达32%以上;贝氏体等温温度为420℃时能获得最佳的综合力学性能,抗拉强度随贝氏体相变时间增加而下降,延伸率随之上升,而屈服强度没有显著变化.无Si TRIP制的铁素体晶粒大小约为3~4μm,比含Si TRIP钢铁素体晶粒细小;残余奥氏体的体积分数在8%~10%,比含Si TRIP钢低约3%;420℃保温300 s后贝氏体相变基本结束,而碳的扩散仍然在进行;无Si TRIP钢贝氏体相变速率比含Si TRIP钢快,贝氏体相变总量也更多.
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| 关 键 词： | TRIP钢 硅 力学性能 微观组织 相变 |
| 收稿时间： | 2012-04-04 |
Mechanical properties and microstructure of continuous annealing TRIP steel without Si |
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| DING Wei, GONG Zhi-hua, TANG Di, JIANG Hai-tao, WANG Bao-feng. Mechanical properties and microstructure of continuous annealing TRIP steel without Si[J]. Chinese Journal of Engineering, 2013, 35(3): 319-324. DOI: 10.13374/j.issn1001-053x.2013.03.008 |
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| Authors: | DING Wei GONG Zhi-hua TANG Di JIANG Hai-tao WANG Bao-feng |
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| Affiliation: | 1. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China;3. International School, Inner Mongolia University of Science and Technology, Baotou 014010, China |
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| Abstract: | A kind of TRIP steel without Si was heat-treated on a Gleeble3500 thermal simulation testing machine. Its mechanical properties,microstructure,and phase transformation were studied by tensile machine,scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD),and thermal dilatometer.The effects of bainite transformation temperature and time on the mechanical properties and retained austenite in the Si-free TRIP steel were analyzed.It is found that the Si-free TRIP steel has excellent overall mechanical properties with the tensile strength of 740 to 810 MPa and the elongation above 25%,which can reach up to 32%.The best comprehensive mechanical properties can be achieved when the isothermal bainite transformation temperature is 420℃.At this temperature,the tensile strength decreases and the elongation increases with the increase of bainite transformation time, but the yield strength has no significant change.The size of ferrite grains in the Si-free TRIP steel is 3 to 4μm,smaller than that in the Si-containing TRIP steel.The volume fraction of retained austenite is 8%to 10%,about 3%lower than that in the Si-containing TRIP steel.Bainite transitions in the Si-free TRIP steel almost complete at 420℃for 300 s, but the diffusion of C still continues.Compared to the Si-containing TRIP steel,bainite transitions in the Si-free TRIP steel are much faster and the bainite transformation amount is bigger. |
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| Keywords: | TRIP steel silicon mechanical properties microstructure phase transitions |
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