Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第6期    总第147期    2011年6月

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文章编号:1004-0609(2011)06-1272-07
Ti-15-3合金冷轧变形过程中的组织演变及力学性能
郭  强,王  清,韩秀丽,孙东立,孙  涛,武高辉

(哈尔滨工业大学 材料科学与工程学院,哈尔滨 150080)

摘 要: 采用金相显微镜、透射电镜和X射线衍射仪等研究Ti-15-3合金板材在交叉换向轧制过程中的组织演变规律和力学性能变化。结果表明:经过5道次换向冷轧、厚度方向总变形量为80%的Ti-15-3合金板中,形成了间隔的纤维带状组织,其内部形成了200 nm左右的亚微米级晶粒。纤维组织的形成过程分为3个阶段,第一阶段,在个别晶粒内部形成局部剪切带;第二阶段,拉长带状组织内部平行排列的剪切带相互交叉并逐渐碎化;第三阶段,形成间隔的纤维组织,其内部晶粒为亚微米级。在轧制变形中,经1道次变形后,抗拉强度迅速升高到949 MPa,随后抗拉强度最终缓慢增加至1 021 MPa。固溶态合金以每道次30%的压下量经过5道次换向冷轧并于450 ℃时效4 h后,抗拉强度为1 646 MPa。

 

关键词: Ti-15-3合金;冷轧;时效;力学性能

Microstructure evolution and mechanical properties of
Ti-15-3 alloy during cold-rolling
GUO Qiang, WANG Qing, HAN Xiu-li, SUN Dong-li, SUN Tao, WU Gao-hui

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China

Abstract:The microstructure evolution and mechanical properties of Ti-15-3 alloy during cold rolling were investigated by optical microscopy, transmission electron microscopy and X-ray diffractometer. The results show that fibrous microstructure in which grains are refined to about 200 nm was formed in the sheet of Ti-15-3 alloy with total thickness reduction of 80% after five passes cross cold rolling. The structure formation may be divided into three steps: firstly, the partial shear bands form in some grains; secondly, the shear bands of different direction within the banded structure cross and refine; thirdly, the fibrous microstructure with sub-micron grains forms. During cold rolling, the ultimate strength of alloy increases sharply to 949 MPa after 1 pass and slightly to 1 021 MPa in the following passes. After 5 passes cross cold rolling with cold rolling rate of 30% per pass and aging at 450 ℃ for 4 h, the ultimate strength of alloy can be increased to 1 646 MPa.

 

Key words: Ti-15-3 alloy; cold rolling; aging; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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