Electron Beam Melting and Improvement of Mechanical Properties of Pure Tantalum

纯钽的电子束熔炼及其机械性能的改善

• 批准号: 04650063
• 负责人: TAKAAI Tetsuya
• 金额: $ 1.34万
• 依托单位: Yamanashi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650063/
• 关键词: electron beam melting; pure tantalum; refining; yielding behaviors; macroscopic mechanical properties; microscopic mechanical properties

Effect of the temperature and strain rate on the tensile yielding and flow of pure tantalum plate, produced by electron beam melting method, was experimentally studied mainly from an engineering viewpoints of fundamental tensile m, mechanical properties and their temperature and strain rate dependency. Sharply projected yielding behaviors were here seen for electron beam melted tantalum under certain specified tensile testing and annealing conditions. Critical temperature for the temperature dependence of the tensile plastic flow was about 0.15 T/Tm which was slightly higher as compared to 0.12 T/Tm of pure tantalum produced by powder metallurgy.Distinctive brittleness was observed below 250 K regarding the measurements of the uniform elongation for the highest strain rate conditions and ductile to brittle transition was seen for the electron beam melted tantalum at the temperatures ranging from 300 to 250 K.Activation energy and activation volume obtained at temperatures below 380 K in accordance with the yielding or flow of pure tantalum were almost the same as those values measured regarding pure tantalum produced by power metallurgical technology.

从基本拉伸模量、力学性能及其温度和应变速率依赖性等工程角度，研究了温度和应变速率对电子束熔炼纯钽板材拉伸屈服和流动的影响。在某些特定的拉伸试验和退火条件下，电子束熔融钽的屈服行为明显。拉伸塑性流动的温度依赖性的临界温度为约0.15 T/Tm，与0.12 T/Tm相比略高。在最高应变速率条件下测量的均匀延伸率方面，在250 K以下观察到明显的脆性，在250 K以下观察到电子束熔化钽的韧脆转变。在低于380 K的温度下根据纯钽的屈服或流动获得的活化能和活化体积与关于通过粉末冶金技术生产的纯钽测量的那些值几乎相同。

项目成果

T.Takaai, T.Izumi, Y.Nakayama: "Strain Rate Dependence of the Tensile Flow Stress of Pure Tantalum" Proceedings for Asia-Pacific Symposium on Advances in Engineering Plasticity and its Applications, Hong Kong. December 15-17. (1992)

T.Takaai、T.Izumi、Y.Nakayama：“纯钽拉伸流动应力的应变率依赖性”会议录，亚太工程塑性及其应用进展研讨会，香港。

Tetsuya TAKAAI Tomoo IZUMI Yoshihiro NAKAYAMA: "Strain Rate Dependence of the Tensile Flow Stress of Pure Tantalum" Proceeding for Asia-Pacific Symposium on Advances in Engineering Plasticity and Its Applications. (1992)

Tetsuya TAKAAI Tomoo IZUMI Yoshihiro NAKAYAMA：“纯钽拉伸流动应力的应变率依赖性”，亚太工程塑性及其应用进展研讨会论文集。

林俊哉 鷹合徹也 泉知夫 中山栄浩: "電子ビーム溶解タンタルの冷間加工と再結晶" 日本金属学会1993年秋期大会講演概要集. (1993)

Toshiya Hayashi、Tetsuya Takaai、Tomoo Izumi 和 Eihiro Nakayama：“电子束熔化钽的冷加工和再结晶”日本金属学会 1993 年秋季会议摘要（1993 年）。

鷹合徹也 泉知夫 中山栄浩: "電子ビーム溶解タンタルの変形応力のひずみ速度依存性" 日本機学会論文集 投稿中. (1994)

Tetsuya Takaai、Tomoo Izumi 和 Eihiro Nakayama：“电子束熔化钽中变形应力的应变率依赖性”日本机械工程师学会会议记录，目前正在提交（1994 年）。

T.Hayashi, T.Takaai, Y.Nakayama: "Cold Working and Recrystallization of Electron Beam Melted Pure Tantalum" Proceeding for 1993 Autumn Meeting of the Japan Institute of Metals, Nagoya. October 16. (1993)

T.Hayashi、T.Takaai、Y.Nakayama：“电子束熔化纯钽的冷加工和再结晶”，日本金属学会 1993 年秋季会议论文集，名古屋。