【摘 要】
：
研究了高强度低密度Fe-12Mn-8Al-O.8C三相钢的微观组织和力学性能.结果表明,实验钢在退火处理后的奥氏体基体中,分布着带状铁素体和纳米级的有序(Fe,Mn)3AlCx(K))碳化物.实验钢具有较高的抗拉强度(920 MPa),良好的延伸率(46.4％)和较低的密度(7.05 cm3/g).实验钢550℃时效10 min时,抗拉强度高(1010 MPa),塑性也较好(37.8％). 随着时
【机 构】
：
东北大学材料与冶金学院,辽宁沈阳 110819 东北大学秦皇岛分校,河北秦皇岛066004
论文部分内容阅读
研究了高强度低密度Fe-12Mn-8Al-O.8C三相钢的微观组织和力学性能.结果表明,实验钢在退火处理后的奥氏体基体中,分布着带状铁素体和纳米级的有序(Fe,Mn)3AlCx(K))碳化物.实验钢具有较高的抗拉强度(920 MPa),良好的延伸率(46.4％)和较低的密度(7.05 cm3/g).实验钢550℃时效10 min时,抗拉强度高(1010 MPa),塑性也较好(37.8％). 随着时效时间的增加,在奥氏体基体和晶界产生大量( Fe,Mn)3AlCx(K))碳化物,抗拉强度升高而延伸率降低.这可能是由于纳米级细小的K相碳化物一方面强化基体,导致强度的升高,另一方面在晶界处形成的硬脆的K相碳化物,导致延伸率降低。
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