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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Fe-Mn-Al轻质高强钢组织和力学性能研究*
DOI: 10.11900/0412.1961.2013.00850, PP. 897-904
Keywords: Fe-Mn-Al钢,轻质高强钢,固溶处理,位错滑移
Abstract:
对热轧态与固溶处理后Fe-Mn-Al轻质高强钢进行力学性能检测及组织形貌观察,分析950~1100℃固溶处理工艺对其组织和力学性能的影响规律,根据真实应力-应变曲线和加工硬化曲线分析拉伸变形特征,对比拉伸变形前后微观组织形貌和XRD谱,研究其微观变形机理.研究结果表明,所设计的成分体系实验用钢,热轧后为奥氏体基体与少量带状铁素体的双相组织,密度为6.55g/cm3,达到了轻质高强的设计目标.固溶处理有利于奥氏体晶粒长大与带状铁素体的破碎分解,使钢板强度降低而塑性提高,但是过高的固溶温度会促进铁素体长大,使铁素体体积分数增大,钢的断后伸长率降低.1050℃固溶处理后Fe-Mn-Al钢抗拉强度为925.9MPa,断后伸长率为50.20%,强塑积为46.48GPa·%.连续的应变强化行为使得Fe-Mn-Al钢获得高强度与塑性的良好匹配,稳定硬化阶段应变范围越宽,断后伸长率越大;较高的层错能使其变形机理区别于TRIP和TWIP效应,变形后仍为奥氏体+铁素体双相组织,变形后奥氏体中可以观察到Taylor晶格、高密度位错墙以及微带结构,为明显的平面滑移特征.
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