您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 6    December 2003

[PDF Download]    [Flash Online]

    

Isothermal forging of γ-TiAl based alloys
HUANG Zhao-hui(黄朝晖)

National Defense Key Laboratory of Advanced High Temperature Structural Materials,Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:The true stress—strain curves and processing window of Ti-47Al-2Cr-1Nb were set up through thermal physical simulation. A method for refinement of the as-cast+HIPped structure was submitted, which included two-step deformation with a short intermediate heat-treatment between double deformations. The break-down operation of the canned ingot was performed by the isothermal forging processing mentioned above. The refining mechanism is characterized as breaking and bending of the as-cast+HIPped lamellae, dynamic recrystallization, and static globularization. Thus, a uniform and refined billet microstructure is obtained for the final component by forging operation. The deformation of a model disc is accomplished by the subsequent single-step isothermal forging at 1100-1150℃ using a closed compression die.

 

Key words:   TiAl alloy; isothermal forging; microstructure

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn