配料及制备工艺对TZM合金组织和力学性能的影响  

Effect of Ingredients and Preparation Process on the Microstructure and Mechanical Properties of TZM Alloy

作　　者：夏春林 周红灯 叶康源 田青超 XIA Chun-lin;ZHOU Hong-deng;YE Kang-yuan;TIAN Qing-chao(AVIC Guizhou Anda Aviation Forging Co.,Ltd.,Anshun 561005,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China)

机构地区：[1]贵州安大航空锻造有限责任公司,贵州安顺561005 [2]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444

出　　处：《稀有金属与硬质合金》2025年第2期129-138,共10页Rare Metals and Cemented Carbides

摘　　要：采用掺杂TiH_(2)+ZrH_(2)、TiC+ZrC及TiC+ZrC+HfC等不同配料方式制备了TZM合金,研究了采用不同烧结及真空热压工艺制备的合金的微观组织和力学性能。结果表明,改变Ti、Zr加入形式及添加HfC可提高钼合金的密度,相比于添加TiH_(2)+ZrH_(2),添加TiC+ZrC或TiC+ZrC+HfC烧结的合金密度由9.51 g/cm^(3)分别提高至9.71、9.81 g/cm^(3)。烧结后再进行热压,不同配料方式的合金致密度均明显提高,且加压后保压对于提高合金致密度更为有效。不同配料方式的原始成分在合金烧结过程中均发生分解和扩散,形成Mo固溶体相。相比于添加TiH_(2)+ZrH_(2),添加TiC+ZrC或TiC+ZrC+HfC制备的合金晶粒更为细小,而添加的TiC、ZrC和HfC颗粒可通过溶解及析出达到晶粒细化的效果。在添加TiC+ZrC的基础上添加HfC,可使得相同工艺制备的合金屈服强度由314 MPa提升至390 MPa,约提升24%。HfC有利于晶界的净化和Mo基体的晶粒细化,从而提高钼合金的强度。TZM alloys were prepared by doping TiH_(2)+ZrH_(2),TiC+ZrC and TiC+ZrC+HfC,respectively,and the microstructure and mechanical properties of the alloys prepared by different sintering and vacuum hot pressing processes.The results indicate that the density of the alloys can be improved by changing the form of Ti and Zr addition and adding HfC.Compared with the addition of TiH_(2)+ZrH_(2),the density of the alloys prepared by adding TiC+ZrC and TiC+ZrC+HfC increases from 9.51 g/cm^(3) to 9.71 g/cm^(3) and 9.81 g/cm^(3),respectively.The relative density of the alloys with different ingredients is significantly improved when hot pressing is carried out after sintering,in which maintaining pressure after pressurization is more effective in increasing the relative density of the alloys.The original ingredients with different doping methods undergo decomposition and diffusion during the sintering process of the alloys,forming Mo solid solution phase.In comparison with the addition of TiH_(2)+ZrH_(2),the alloys prepared by adding TiC+ZrC and TiC+ZrC+HfC have smaller grains,and the added TiC,ZrC and HfC particles can achieve grain refinement through dissolution and precipitation.Adding HfC beyond TiC+ZrC can increase the yield strength of the alloy prepared by the same process from 314 MPa to 390 MPa,with an improvement of about 24%.HfC is beneficial for the purification of grain boundaries and the refinement of Mo matrix grains,thereby improving the strength of molybdenum alloy.

关 键 词：钼合金 TZM 力学性能 显微组织 烧结 热压 配料 

分 类 号：TG146.412[一般工业技术—材料科学与工程]