X.C. Wei
,
L. Li
,
R.Y. Fu
金属学报(英文版)
Tensile mechanical properties of 1.6Si-1.58Mn-0.195C TRIP (transformation-inducedplasticity) steels under high strain rate and effects of DP (dual-phase) treatments werestudied and compared to the quasi-static tensile behavior. The results show that theincreasing of strain rate leads to increasing in their strengths and decreasing in theuniform elongation remarkably. Because the stable retained austenite in TRIP steelcan transform to martensite during tensile testing and the material exhibits excellentcharacteristic of transformation induced plasticity, the plastic deformation behavior isevidently improved and the combination of strength and elongation is superior to thatof dual-phase steel, although its strength is smaller than that of DP steel. However,DP treated steel shown lower elongation under dynamic tension in spite of higherstrength. A model was proposed to explain the excellent elongation rate of TRIPsteel compared with DP steel on the basis of SEM analysis and the strength of thecomponents in microstructure.
关键词:
automobile sheet steel
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null
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null
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null
李麟
,
刘仁东
上海金属
为解决含铝相变塑性钢连铸时堵水口问题,上海大学和鞍钢联合课题组经热力学和动力学计算,成功预测了磷可以替代铝的应变诱发相变作用.与鞍钢经大量试验证实后,在产线上成功生产并应用于一汽奔腾车型上,为其通过国家的C-NCAP碰撞测试并取得优异成绩,作了贡献.课题组依层错热力学计算,设计了具有孪晶诱发塑性+相变诱发塑性的孪晶塑性钢,并在国际上首创了转炉冶炼高锰钢,生产出的热轧和冷轧孪晶塑性汽车钢,性能国际领先,产品应用在一汽一款重点开发的有极重要用途的高级品牌车上.课题组在国际上首先发现了铝在钢中的热力学数据有严重错误,在纠正了这些错误后通过计算发现铝可大大提高钢中奥氏体含碳量和相变塑性,由此生产的超高强度相变塑性钢,当强度达1 023 MPa时,断后伸长率为22％,这已是目前世界上低合金汽车钢所达最高强塑积.
关键词:
相变塑性
,
孪晶塑性
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汽车用钢
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转炉
,
热力学
