东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (5): 723-728.DOI: 10.12068/j.issn.1005-3026.2020.05.019

• 材料与冶金 • 上一篇    下一篇

薄带连铸因瓦合金的组织、织构及力学性能研究

宋红宇, 刘海涛, 王国栋   

  1. (东北大学 轧制技术及连轧自动化国家重点实验室, 辽宁 沈阳110819)
  • 收稿日期:2019-09-27 修回日期:2019-09-27 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 宋红宇
  • 作者简介:宋红宇(1986-),男,河北邢台人,东北大学博士后研究人员; 刘海涛(1981-),男,山东沂水人,东北大学教授,博士生导师; 王国栋(1942-),男,辽宁大连人,东北大学教授,博士生导师,中国工程院院士.
  • 基金资助:
    国家自然科学基金青年基金资助项目(51804073); 中国博士后科学基金资助项目(2018M630296); 中央高校基本科研业务费专项资金资助项目(N170703007).

Study on Microstructure,Texture and Mechanical Properties of Strip Casting Invar Alloy

SONG Hong-yu, LIU Hai-tao, WANG Guo-dong   

  1. State key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2019-09-27 Revised:2019-09-27 Online:2020-05-15 Published:2020-05-15
  • Contact: SONG Hong-yu
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摘要: 将薄带连铸技术引入因瓦合金的制备流程,利用金相显微镜、XRD、EBSD、微观硬度计、拉伸实验机等设备,围绕薄带连铸因瓦合金的组织织构演化及力学性能开展研究.结果表明:在钢液过热度较高的条件下,因瓦合金凝固组织以粗大的柱状奥氏体晶粒为主,织构为强烈的λ纤维织构(<100>//ND).冷轧过程中形成大量的变形亚结构,使硬度(HV)由铸态的165提高至230~240,冷轧织构以典型的铜型织构(112<111>)及S型织构(123<634>)为主.0.7mm厚冷轧板经900℃退火10min,形成包含大量退火孪晶的再结晶组织,织构较漫散,其屈服强度、抗拉强度和断后延伸率分别达293MPa,433MPa和33.4%,与传统流程制备的0.7mm厚因瓦合金的性能相当.

关键词: 薄带连铸, 因瓦合金, 冷轧, 组织, 织构, 力学性能

Abstract: The twin-roll strip casting technology was introduced into the process of manufacturing invar alloy. Using optical microscope, XRD, EBSD, micro hardness(HV) and tensile testing instruments, the evolution of microstructure, texture and mechanical properties of the strip-casted invar alloy were investigated. The results show that the solidification microstructure of the strip-casted invar alloy is dominated by the coarse columnar grains of austenite and the associated texture is mainly the strong λ-fiber texture(<100>//ND). Thereafter, a large amount of deformation substructures are formed during a cold-rolling process, which increase the hardness(HV) from 165 to 230~240, and the cold-rolled texture is mainly composed by the typical copper texture (112<111>) and S texture (123<634>). A recrystallization microstructure containing numerous annealing twins together with a weak texture is observed in the 0.7mm-thick sheet after annealing at 700℃ for 10min. The yielding strength, tensile strength and final elongation are 293MPa, 433MPa and 33.4%, respectively, which are similar to those of the 0.7mm-thick annealed sheet produced by the conventional process.

Key words: strip casting, invar alloy, cold rolling, microstructure, texture, mechanical properties

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