Effect of Microstructure on Mechanical Properties of Hot Rolled Bainitic Dual-phase Steel
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摘要: 通过超快冷工艺试验,得到了强韧性较好的热轧贝氏体双相钢,研究了双相钢中组织对性能的影响。研究结果表明,试验钢由贝氏体与铁素体组成,其抗拉强度可达到501 MPa,伸长率在34%左右。试验钢良好的机械性能与贝氏体组织有关,硬相贝氏体含量过多和珠光体均会恶化扩孔性能,大量的多边形铁素体和准多边形铁素体有效地提高了双相钢抗延迟断裂的能力,有利于试验钢伸长率和扩孔率的提高。Abstract: In this work the bainitic dual-phase steel with combined high strength and good toughness had been achieved through ultra-fast cooling after hot rolling.The effect of microstructure on hole expansion performance and mechanical properties had been studied.The resulted steel is mainly composed of ferrite and bainite,with tensile strength of 501 MPa and total elongation of 34%.The good mechanical property of steel is related to bainite.Excess hard phase bainite and pearlite deteriorate hole expansion performance,however,large fraction of polygonal and quasi polygonal ferrite can improve the elongation and hole expansion.
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Key words:
- dual-phase steel /
- bainite /
- ferrite /
- mechanical property /
- hole expansion performance
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