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TRIP-相变诱发塑性钢的研究进展 总被引:16,自引:2,他引:16
相变诱发塑性钢是一种汽车用钢,通过相变诱发塑性(TRIP)效应使钢板中残余奥氏体在塑性变形作用下诱发马氏体生核和形成,并产生局部硬化,继而变形不再集中在局部,使相变均匀扩散到整个材料以提高钢板的强度和塑性。典型TRIP钢c含量为0.2%,Mn 1%~2%,Si 1%~2%,通过热轧变形热处理或冷轧 热处理,TRIP钢的组织由50%~60%铁素体,25%~40%贝氏体或少量马氏体和5%-15%残余奥氏体组成。TRIP钢的强度和韧性高于双相钢和微合金钢。介绍了TRIP钢的生产工艺和性能,残余奥氏体、合金元素、热处理对TRIP效应的影响和TRIP钢研究趋势。 相似文献
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等温淬火温度对C-Si-Mn系TRIP钢组织和力学性能的影响 总被引:1,自引:1,他引:0
利用金相显微镜和X射线衍射方法研究了0.11C-1.23Si-1.65Mn冷轧TRIP钢等温淬火温度对组织和力学性能的影响.结果表明,实验钢在840℃×180 s退火 420℃× 240 s等温处理后可得到6.55%的残余奥氏体,此时可获得较佳的相变诱发塑性和较好的强韧性配合,其强塑积可达到2.28×104MPa·%,提高或降低等温温度都会降低强塑积.在840℃退火,适当延长退火时间,可提高残余奥氏体体积分数及碳含量,有助于提高材料的综合性能. 相似文献
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采用场发射扫描电镜和X射线衍射仪研究配分过程中低碳硅锰系QP钢的组织演变规律,分析残余奥氏体含量的变化规律及其与QP钢塑性之间的关系。结果表明:配分温度在450℃以上和配分时间在200 s以上都会使马氏体和残余奥氏体发生分解,并伴有大量的白色粒状碳化物析出。配分温度和配分时间决定室温下残余奥氏体的含量,配分温度在400℃左右和配分时间在30 s左右,配分过程中残余奥氏体中的碳含量较高,最终稳定到室温的残余奥氏体含量增加;残余奥氏体含量随着配分温度的升高呈先升高后下降的趋势,随配分时间的延长呈逐渐下降的趋势,延伸率与残余奥氏体含量的变化趋势相似。 相似文献
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利用Gleeble 1500热应力 应变模拟机研究了铌含量、热变形参数(终轧温度和卷取温度)对相变诱发塑性(TRIP)钢组织和性能的影响。实验结果表明:不含铌实验钢的残余奥氏体量、残余奥氏体相中的碳含量、宏观维氏硬度和抗拉强度与常规低碳硅锰系TRIP钢的水平相当;增加铌含量,残余奥氏体量和残余奥氏体相中的碳含量有所下降,而宏观维氏硬度和抗拉强度提高;铌含量为0014%、终轧温度为780 ℃、卷取温度为400 ℃时,残余奥氏体量、残余奥氏体相中的碳含量与宏观维氏硬度和抗拉强度具有最佳组合。 相似文献
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���±����Ž����������ŷ壬��ΰ������� 《钢铁研究学报》2015,27(11):54-59
Forming limit diagram (FLD) of cold- rolled TRIP steel was established by experiments. The microstructures of samples before and after deformation were examined by metalloscopy and scanning electron microscopy and at the same time the contents of retained austenite after different strain ratios were measured by X- ray diffraction. The results show that the ultimate strain under plane strain state(FLD0) is 0. 397. With the strain ratio increasing, strain path changes from uniaxial stretching to plane strain and then biaxial stretching and the transformation amount of residual austenite increases gradually. Compared with dual- phase steel, the higher FLD0of TRIP steel is ascribed to TRIP effect and necking area is wider during deformation. 相似文献
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采用现代高分辨电子-光学分析技术及光学显微镜等,对低碳Ni-Cr-Mo钢(C≥0.06%)中M/A岛及其回火特性进行分析。结果表明,有两种类型的M/A岛,一种为可聚成团状的小尺寸M/A岛(即粒状贝氏体中的M/A岛),它所在的铁素体基体呈胞状结构,位错密度较高,胞状之间为小角度关系;另一种为孤立的块状M/A岛(类似双相钢中的M/A岛),它所在的铁素体基体与多边形铁素体类似,位锗密度较低,透射电镜下没有看到亚结构。前者M/A岛碳含量较高,回火后析出的碳化物尺寸较粗大。而且前者M/A岛中残留奥氏体量比后者高,故粒状贝氏体回火抗力较大是由于残留奥氏体量较多的缘故。 相似文献
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Industrial processing of low‐alloy Transformation Induced Plasticity (TRIP) steels involves various stages of heat‐treating, such as Intercritical Annealing (IA) and Bainitic Isothermal Treatment (BIT), in order to produce a dispersion of retained austenite (γR) particles and bainite (αB) in a ferritic matrix (α). Retained austenite then transforms to martensite (α′) during forming processes undergone by the steel. In the present work an effort was made to model these stages of processing, i.e. IA, BIT and the γR→α′ strain‐induced transformation. Simulation of heat‐treatment stages was implemented using computational kinetics methods. Investigation of the strain‐induced gMR→α′ transformation kinetics was performed by means of a simple analytical model. Simulation of IA and comparison with available experimental data showed that the amount of austenite (γ) forming during IA reaches the values predicted by thermodynamic equilibrium only at high annealing temperatures (>825°C). It was also observed that kinetic and thermodynamic predictions set a lower and an upper limit, respectively, within which the actual amount of austenite experimentally observed is contained. Results from the simulation of the BIT indicated considerable carbon enrichment, and thus stabilization of γR, in agreement with recent experimental observations. As regards the strain‐induced gMR→α′ transformation, the analytical model employed in the present work was fitted to available experimental results, showing reasonably good adaptation to the kinetic behaviour of the microstructure during plastic deformation. 相似文献
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Tensile tests for two commercial TRIP‐aided steels with the compositions of 0.091%C‐1.456%Si‐1.061%Mn and 0.134%C‐1.525%Si‐1.226%Mn in the strain rate range of 10?4‐103 s?1 were performed. Results for a pneumatic indirect bar‐bar tensile impact tester displayed sensitivity of tensile properties to strain‐rate within the testing range. XRD analysis for the relationship between the strain‐hardening exponent and the strain‐induced transformation of retained austenite suggested significant influence of the transformation of retained austenite on their work‐hardening behaviour. 相似文献
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稀土对低碳钢马氏体相变的影响 总被引:9,自引:0,他引:9
0.27C-1Cr钢中加入稀土,细化奥氏体晶粒,降低Ms,缩小马氏体条宽,减少残余奥氏体量,并抑制自回火过程。稀土偏聚在原奥氏体晶界,不因马氏体盯变而改变。根据以往证明:低碳钢马氏体相变中存在碳的扩散,则低碳钢淬火后的残余奥氏体量不但决定于Ms和淬火介质温度(Tq),还受合金元素对碳扩散的影响。由此将Magee公式修改为:γ(%)=exp[α(C1-C0)-β(Ms-Tq)]其中C0和C1分别为淬 相似文献