Effect of Heat Treatment on Microstructure and Properties of as-Forged TiAl Alloy with β Phase

摘要:

采用包套锻造技术成功制备Ti-45Al-5.4V-3.6Nb-0.3Y合金锻饼，并研究热处理对该合金锻饼组织和性能的影响。通过热处理得到3种不同的组织形态，分别为双态、近层片、和全层片组织，分析热处理过程中合金组织的演变规律，并对不同组织形态的合金进行力学性能测试。结果发现，双态组织的合金具有最好的室温塑性，其值可达1.35%，近层片组织的合金具有较高的室温强度，屈服强度为605.31 MPa，断裂强度为665.75 MPa

Abstract:

The canned forging pancake of Ti-45Al-5.4V-3.6Nb-0.3Y alloy was prepared, and the microstructure control and properties for various microstructures of as-forged alloy were studied. Three different microstructures, duplex, nearly lamellar and fully lamellar, were obtained through heat treatments. The microstructure evolution was analyzed and tensile properties were measured. The results show that the treated sample with duplex microstructure exhibits the best ductility, and its elongation reaches 1.35%; the alloy with nearly lamellar microstructure has better strength, i.e.yield strength and fracture strength are 605.31 MPa and 665.75 MPa at room temperature, respectively