Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-alpha Titanium Alloy

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	Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-alpha Titanium Alloy
	Z. Y. Chen; J. W. Li; J. Liu; Q. J. Wang; J. R. Liu; R. Yang
	2010
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	26 期号:6 页码:564-571
摘要	The high temperature creep behavior of fusion zone (FZ) and base metal (BM) of the electron beam weldments of a near-alpha titanium alloy Ti-60 has been investigated. While the BM shows a fully transformed, coarse primary beta grains with large colonies consisting of aligned alpha lamellar, the FZ exhibits thin martensitic alpha' platelets in the columnar beta grains. The creep results show that the steady state creep rates of FZ follow the power-law creep, with the stress exponents obtained in the range from 5.6 (550 degrees C) to 5.9 (600 degrees C), and corrected activation energies of 309-352 kJ/mol; the stress exponents of BM exhibit different values when the creep testing stress and temperature alternate. The values of 2.4-3.2 are obtained when the stresses are under 220 MPa or the temperature is 550 degrees C, also an exponent of 6.6 is achieved at stresses above 220 MPa at 600 degrees C. The corrected activation energies of BM corresponding to the stress exponents are 123-161 kJ/mol (n=2.4-3.2) and 344 kJ/mol (n=6.6). The creep mechanisms of FZ and BM have been discussed in light of the creep microstructures, activation energies and the stress exponents. The creep mechanisms of FZ is the diffusion controlled dislocation climb, the creep of BM is controlled by 'solute drag' creep and dislocation climb when the stress and temperature are different. Transmission electron microscopy (TEM) observations of the dislocation structures of crept specimens are presented to give some supports for the creep behavior of FZ and BM. In addition to the creep mechanism of dislocation movement, the interface sliding has been found to play an important role during creep of FZ.
部门归属	[chen, zhiyong; wang, qingjiang; liu, jianrong; yang, rui] chinese acad sci, div titanium alloys, inst met res, shenyang 110016, peoples r china. [li, jinwei] beijing aeronaut mfg technol res inst, res dept high energy dens beam proc technol, beijing 100024, peoples r china. [liu, jie] avic shenyang liming aeroengine grp corp ltd, shenyang 110043, peoples r china.;wang, qj (reprint author), chinese acad sci, div titanium alloys, inst met res, shenyang 110016, peoples r china;qjwang@imr.ac.cn
关键词	Steady State Creep Stress Exponent Activation Energy Electron Beam Welding Near-alpha Titanium Alloy High-temperature Ti Microstructure Deformation Welds Toughness
URL	查看原文
WOS记录号	WOS:000280260400010
引用统计	被引频次：20[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31042
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Y. Chen,J. W. Li,J. Liu,et al. Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-alpha Titanium Alloy[J]. Journal of Materials Science & Technology,2010,26(6):564-571.
APA	Z. Y. Chen,J. W. Li,J. Liu,Q. J. Wang,J. R. Liu,&R. Yang.(2010).Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-alpha Titanium Alloy.Journal of Materials Science & Technology,26(6),564-571.
MLA	Z. Y. Chen,et al."Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-alpha Titanium Alloy".Journal of Materials Science & Technology 26.6(2010):564-571.