高密度钨合金静液挤压形变及其形变时效强化的研究

采用新近发展的静液挤压加工技术,对传统的W-Ni-Fe合金进行加工形变,并研究了形变时效强化作用。静液挤压加工具有良好的润滑条件和变形均匀等特点,可以提高高密度钨合金的工艺塑性,明显改善合金的力学性能。在对变形合金进行退火时发现,W-Ni-Fe合金在加热到500~600℃时有一形变时效强化区,经过时效处理的合金,其抗拉强度为1530MPa。系统研究了变形量和形变时效温度对合金力学性能的影响,讨论了合金强化的主要原因。作者认为,静液挤压加工技术是高密度钨合金形变加工的最佳工艺;随后的形变时效处理有利于进一步提高合金强度,其强化主要是钨颗粒和界面强化所致。

STUDY ON ISOSTATIC EXTRUSION DEFORMATION OF HIGH DENSITY TUNGSTEN ALLOY AND ITS DEFORMATION AGING STRENGTHENING

By using recently developed isostatic extrusion processing technology,work deformation was conducted for conventional W-Ni-Fe alloy and influence on its deformation aging strengthening was studied. Isostatic extrusion working has the characteristics of lubrication condition and homogeneous deformation, etc. and is caP8ble of raising the technological plasticity of high density tungsten alloy and obviously improving the mechanical properties of alloy. Furthermore,it has been found during annealing process of defomed alloy that there is a deformation aging strengthening area 500~600℃. The tensile strength of an age-treated alloy is 1530 MPa. The paper has systematically studied the influence of deformation quantity and deformation asing temperature on the mechanical properties of alloy and discussed the main cause of alloy strengthening. The authors hold that the isostatic extrusion working is the best technology for high density tungsten alloy deformation working and the following deformation aging treatment is favourable for further improvement strength of alloy. The strength effect is mainly due to the strengthening of tungsten particle and interface.