机械合金化Fe-Mn-Al-C低密度钢合金粉末的烧结特性

SinteringProperties of Mechanically Alloyed Fe Mn Al C Low density Steel Alloy Powder

为了解决低密度钢在轻量化部件应用上的强度不足的问题,本文利用机械合金化与热压烧结相结工艺制备了Fe-20Mn-9Al-1.3C与Fe-4Mn-6Al-0.04C两种低密度钢。分析了球磨与烧结工艺分别对于Fe-Mn-Al-C低密度钢制备过程中的物相、组织和性能的影响。研究结果表明:Fe-20Mn-9Al-1.3C混合粉末经10h高能球磨后形成的合金主要由αFe固溶体相组成,该粉末在1000℃烧结后主要物相为γFe固溶体相,其密度、硬度和抗压强度分别为6.54 g·cm^(-3),50.76HRC,2212.08 MPa。Fe-4Mn-6Al-0.04C混合粉末经10 h高能球磨后形成的合金主要由αFe固溶体相组成,该粉末于1000℃烧结后主要物相为αFe固溶体相,合金的密度、硬度和抗压强度分别为7.03 g·cm^(-3)、47.51HRC和1642.61 MPa。为低密度钢耐磨零部件的研发提供一定的理论参考。

The study aims to solve the problem that low density steel is not strong enough when applied to lightweight parts.Two kinds of low density steel(Fe-20Mn-9Al-1.3C and Fe-4Mn-6Al-0.04C)were prepared by mechanical alloying and hot pressing sintering.The impact of ball milling and sintering on the phase,microstructure and properties of Fe-Mn-Al-C low density steel were analyzed.The results are as follows.The alloy made from Fe-20Mn-9Al-1.3C mixed powder by 10 hour high energy ball milling is mainly composed ofαFe phase.The powder which was sintered at 1000℃is mainly composed ofγFe phase,whose density,hardness and compressive strength are 6.54 g·cm^(-3),50.76HRC,and 2212.08 MPa respectively.The alloy formed from Fe-4Mn-6Al-0.04C mixed powder by 10 hour high energy ball milling is mainly composed ofαFe phase.The powder sintered at 1000℃is mainly composed ofαFe phase,whose density,hardness and compressive strength are 7.03 g·cm^(-3),47.51HRC and 1642.61 MPa.The results provide some theoretical reference for the research and development of wear resistant low density steel parts.