Ti(C,N)对Ni基高温合金组织结构、力学性能和抗氧化性的影响  

Effect of Ti(C,N) on Microstructure, Mechanical Properties and Oxidation Resistance of Ni-based Superalloys

作　　者：杨青青[1] 熊惟皓[1] 张国鹏[1] 黄玉柱[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《稀有金属材料与工程》2012年第12期2127-2130,共4页Rare Metal Materials and Engineering

基　　金：中国博士后科学基金(20080440929)

摘　　要：采用粉末冶金法制备Ni-20Cr-4Mo-0.15C和Ni-20Cr-4Mo-0.15C-12.85TiC-3TiN(质量分数,%)两种合金,研究Ti(C,N)质点引入对Ni基高温合金组织结构、力学性能和800℃抗氧化性的影响。结果表明,经1280℃真空烧结1h后,因12.85%TiC和3%TiN引入形成的Ti(C,N)质点,弥散分布于奥氏体基体的晶内和晶界处,使奥氏体基体晶粒明显细化,合金的密度从8.38g/cm3降至7.59g/cm3,维氏硬度从1850MPa升至3430MPa,抗拉强度从752MPa升至1192MPa。此外,合金在800℃空气中仍具有较好的抗氧化性,形成的氧化膜主要由α-Cr2O3和TiO2组成。Ni-20Cr-4Mo-0.15C and Ni-20Cr-4Mo-0.15C-12.85TiC-3TiN （wt%） alloys were prepared by powder metallurgy method, in order to investigate the effect of Ti（C,N） on microstructure, mechanical properties and oxidation resistance at 800 ℃ of Ni-based superalloys. Results show that due to the addition of 12.85wt% TiC and 3wt% TiN, the formed Ti（C,N） particles dispersed within grains and at grain boundaries of austenite matrix, therefore austenite grains became fine. The density of supralloys decreased from 8.38 to 7.5 g/cm3 , the hardness increased from 1850 to 3430 MPa, and the tensile strength increased from 752 to 1192 MPa. In addition, the superalloys still exhibited good oxidation resistance in air at 800 ℃, and the oxide scale formed mainly consisted of α-Cr2O3 and TiO2 .

关 键 词：NI基高温合金 Ti(C N)颗粒弥散强化 显微组织 力学性能 抗氧化性 

分 类 号：TG132.32[一般工业技术—材料科学与工程]