淬火温度对电弧微铸锻AerMet100钢组织与性能的影响

采用OM、XRD、SEM、TEM和力学性能试验方法，研究了在885～1150℃范围内不同淬火温度对电弧微铸锻增材制造AerMet100超高强度钢组织及力学性能的影响规律。结果表明，电弧微铸锻AerMet100钢原始态组织主要由板条马氏体和奥氏体组成，呈现出快速凝固的组织特征；随着淬火温度的升高，试验钢的凝固组织逐渐消失，当温度超过1050℃时基本上完全消除；断裂韧度随着淬火温度的升高表现出升高的趋势；抗拉强度和屈服强度随着淬火温度的升高没有明显变化；冲击吸收能量随着淬火温度的升高呈现先升高后下降的趋势，在淬火温度为1050℃时达到峰值。在试验温度范围内，1050℃左右淬火可获得优异的强韧性匹配，此时试验钢的断裂韧度为82.9 MPa·m^1/2,抗拉强度为2010 MPa,冲击吸收能量为50 J。

Effect of quenching temperature on microstructure and properties of arc microcast forged AerMet100 steel

Effect of different quenching temperatures in the range of 885-1150 ℃ on microstructure and mechanical properties of arc microcast forged AerMet100 ultra-high strength steel was investigated by means of OM, XRD, SEM, TEM and mechanical property tests. The results show that the original microstructure of the AerMet100 steel consists mainly of slatted martensite and austenite, and with rapid solidification characteristics. With the increase of quenching temperature, the solidification characteristics of the tested steel disappear gradually, and is almost completely eliminated when the temperature exceeds 1050 ℃. With quenching temperature increasing, the fracture toughness of the tested steel shows an increasing trend, while the tensile and yield strengths do not variation significantly, and the impact absorbed energy shows a tendency of first increasing and then decreasing, reaching a peak at 1050 ℃. In the experimental temperature range, quenching at around 1050 ℃ results in an excellent match of strength and toughness, with a fracture toughness of 82.9 MPa·m^1/2, a tensile strength of 2010 MPa, and an impact absorbed energy of 50 J.