GOALI: Optimization of Zircaloy Intermetallics through Chemistry and Processing Controls

目标：通过化学和加工控制优化锆合金金属间化合物

• 批准号: 9632043
• 负责人: K. Linga Murty
• 金额: $ 3.02万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632043&HistoricalAwards=false
• 关键词: GOALI; Optimization; Zircaloy; Intermetallics; through

9632043 Murty This GOALI grant supports an engineering student for a one year period in industry to investigate the effects of alloy chemistry and process factors on specific intermetallic phases which influence zirconium alloy (Zircaloy) properties and performance. Intermetallics undergo changes in structure that affect mechanical properties and corrosion resistance. The structural include phase nucleation, growth and restructuring during material processing, and these changes are strongly influenced by the concentrations of the alloying elements. Variables include beta-quench temperature and quench rate, post-beta-quench cold-work and annealing, and subsequent cold-work/anneal cycles to control final precipitate morphology. The research examines corrosion (nodular and uniform), microstructure (with particular attention to intermetallics), mechanical properties, and manufacturability, evaluated using automated ball indentation. Zirconium alloy sheet material is used to simulate tubing for ease of fabrication and testing. The study is performed in collaboration with the General Electric Company's Zircaloy manufacturing center in Wilmington, NC, and Vallecitos nuclear center in California. %%% Zircaloys are widely used in fission reactors as thin-walled tubing for cladding nuclear fuel, intermediate grids, channels (BWRs), and calandria tubing (PHWRs). The research program allows a student to learn on-site the metallurgical factors associated with the application of this alloy. ***

9632043 Murty 这项 GOALI 赠款支持一名工科学生在工业界进行一年的学习，研究合金化学和工艺因素对特定金属间相的影响，这些相会影响锆合金 (Zircaloy) 的特性和性能。 金属间化合物的结构发生变化，影响机械性能和耐腐蚀性。 结构包括材料加工过程中的相成核、生长和重组，这些变化受到合金元素浓度的强烈影响。 变量包括β淬火温度和淬火速率、β淬火后冷加工和退火以及随后的冷加工/退火循环以控制最终沉淀物形态。 该研究检查了腐蚀（结节性和均匀性）、微观结构（特别关注金属间化合物）、机械性能和可制造性，并使用自动球压痕进行评估。 锆合金板材用于模拟管道，以便于制造和测试。 该研究是与通用电气公司位于北卡罗来纳州威尔明顿的 Zircloy 制造中心和位于加利福尼亚州的 Vallecitos 核中心合作进行的。 %%% 锆合金广泛用于裂变反应堆，作为包壳核燃料的薄壁管、中间栅格、通道 (BWR) 和排管管 (PHWR)。 该研究计划允许学生现场学习与该合金应用相关的冶金因素。 ***