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采用金相显微镜、扫描电镜、X射线能谱仪和力学性能测试等手段,研究了Zr含量对BT25合金等温锻件组织及力学性能的影响。结果表明:采用两相区等温锻造工艺及提高Zr含量可促使BT25合金组织金属流线的形成,抑制了锻后合金冷却时晶界α相的形核及长大,可得到典型的双态组织;随Zr含量增加(由1.65%增加到3.86%),BT25合金在室温,500、550℃高温的拉伸强度和热稳定强度分别提高了161、123、96、57 MPa;断裂韧性由68.9 MPa·m~(1/2)提高至85.5 MPa·m~(1/2)。
The effects of Zr content on microstructure and mechanical properties of isothermal forged BT25 alloy were investigated by means of optical microscope, scanning electron microscopy, X-ray energy dispersive spectroscopy and mechanical properties testing. The results show that the isothermal forging process in two-phase zone and the increase of Zr content can promote the formation of metal flow lines in the BT25 alloy and inhibit the nucleation and growth of the α-phase in the grain boundary when the alloy is cooled. A typical binary microstructure The tensile strength and thermal stability of BT25 alloy increased by 161,123,96 and 57 MPa at room temperature and high temperature of 500 and 550 ℃, respectively, with Zr content increasing from 1.65% to 3.86%. The fracture toughness increased from 68.9 MPa · M ~ (1/2) increased to 85.5 MPa · m ~ (1/2).