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Study on deformation mechanism of ti-2al-2.5zr alloy tube in the flattening test

Journal of Materials Science & Technology 2021年第31期90卷 108-120页

作者： Shengkun Wang Gang Jin Yuntao Wu Xiao Liu Gang Chen School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Nuclear and Radiation Safety Center MEE54#Beijing 100082China School of Chemical Engineering Sichuan UniversitySichuan 610065China Nuclear Power Institute of China ChengduSichuan 610015China

The flattening test,using one pair paralleled plates to flatten tube structure radially,is generally employed to examine the ductility of tube used in once through steam generator(OTSG).This study focuses on the stress condition and deformation mechanism analysis on the concentrated stress regions of ti-2 al-2.5 zr alloy tube during the flattening ***,the finite element analysis was performed using the commercial software ABAQUS to determine the stress ***,the Electron BackScattered Diffraction(EBSD)was implemented to observe the microstructure evolution of ti-2 al-2.5 zr ***,Schmid law was employed to analyze the activated deformation mechanism under condition of the complex *** was found that the condition of the complex stress in stress concentration regions,including tension and compression regions,can be simplified into two directional stresses *** grains whose c-axis is nearly towards TD and ND,the strain is mainly accommodated by prismatic slip,whereas in grains whose c-axis deviates about 45°from ND to TD mainly by basal ***{10-12}extensive twin and corresponding parent grain orientation mainly relied on the stress ***,the intergranular twin pairs connected at common grain boundaries(GBs)with high strain compatibility were found at low angle GBs,which were activated under a combination of macro stress and strain compatibility effect.

关键词： ti-2al-2.5zr alloy tube Flattening test EBSD Stress condition Deformation mechanism Schmid factor Twin pairs Strain compatibility effect

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