热液静挤压93W-4.9Ni-2.1Fe合金显微组织与力学性能

Microstructure and Mechanical Properties of 93W-4.9Ni-2.1Fe Alloy by Hot Hydrostatic Extrusion

采用热液静挤压工艺对液相烧结态93W-4.9Ni-2.1Fe合金进行了变形,挤压温度为1200℃,变形量60%～75%;系统研究了挤压态合金力学性能与显微组织之间的关系。结果表明,挤压态合金的钨颗粒内部表征为高密度位错构成的胞状亚结构,而粘结相在挤压过程中发生了动态再结晶。挤压态合金的强度随着变形量的增大而不断增加,延伸率则随着变形量的增大而不断减小。

Hot hydrostatic extrusion of a liquid-phase sintered 93W-4.9Ni-2.1Fe alloy was performed at 1200℃ at various area reductions from 60% to 75%, and the microstructure and mechanical properties of the as-extruded alloys were experimentally investigated in detail. It is shown that the microstructure of the as-extruded alloy is characterized by elongated tungsten particles with cellular sub-structures consisting of high-density dislocations embedded in a binding phase with fine and dynamically re-crystallized grains. The results show that the tensile strength of the extruded alloy increases, but the elongation decreases with the increase of the area reduction.