摘要
利用光学显微镜、扫描电子显微镜及能谱仪、显微硬度计、X射线衍射仪和拉曼光谱仪等,研究了原位生成ZrC对铸态Y-xZr-yC合金微观组织、硬度及抗高温氧化性能的影响。结果表明:高熔点化合物ZrC的生成抑制了α-Zr相从基体中析出,并促使合金组织从粗晶转变为细小等轴晶;随着ZrC含量的增加,合金晶粒逐渐细化,硬度升高;晶粒尺寸从纯钇的300μm以上减小至Y-5Zr-0.7C合金的55μm,硬度从73 HV0.025提高至123 HV0.025。富Zr相周围氧化膜优先发生开裂,Y-5Zr-0.7C合金的氧化速率相比纯钇更快。
Effects of in-situ formed ZrC on the microstructure,hardness and high-temperature oxidation resistance of as-cast Y-xZr-yC alloys were studied by optical microscope,scanning electron microscope and energy dispersive spectrometer,microhardness tester,X-ray diffractometer and Raman spectrometer.The results showed that(a)the formation of ZrC with high melting point inhibited the precipitation ofα-Zr phase from the matrix,and promoted the transformation of structure of the alloys from coarse grains to fine equiaxed grains;(b)as the content of ZrC increased,the grains of the alloys became gradually refiner and the hardness increased;(c)the grain size decreased from more than 300μm for pure yttrium to 55μm for Y-5Zr-0.7C alloy,and the hardness increased from 73 HV0.025 to 123 HV0.025;(d)the oxide film around the Zr-rich phase preferentially cracked,and the oxidation rate of Y-5Zr-0.7C alloy was faster than that of pure yttrium.
作者
刘澳
潘杰
吴西杰
李慧
高静
王梦琪
梅其良
肖学山
LIU Ao;PAN Jie;WU Xijie;LI Hui;GAO Jing;WANG Mengqi;MEI Qiliang;XIAO Xueshan(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Shanghai Nuclear Engineering Research&Design Institute Co.,Ltd.,Shanghai 200233,China)
出处
《上海金属》
2025年第3期21-28,85,共9页
Shanghai Metals
基金
国家重点研发计划(2022YFB1902800)。
关键词
钇基合金
晶粒细化
ZRC
原位反应
高温氧化
yttrium-based alloy
grain refinement
ZrC
in-situ reaction
high-temperature oxidation
