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Microstructure and mechanical properties of a graded structural material ×÷Õß:Ren, HS (Ren, H. S.)[ 1 ] ; Liu, D (Liu, D.)[ 2 ] ; Tang, HB (Tang, H. B.)[ 2 ] ; Tian, XJ (Tian, X. J.)[ 2 ] ; Zhu, YY (Zhu, Y. Y.)[ 1 ] ; Wang, HM (Wang, H. M.)[ 2 ] MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING ¾í: 611 Ò³: 362-369 DOI: 10.1016/j.msea.2014.06.016 ³ö°æÄê: AUG 12 2014 ²é¿´ÆÚ¿¯ÐÅÏ¢ ÕªÒª Based on the fact that the performance requirements are usually different from one part to another in one component, a novel graded structural material (GSM) of Ti-6Al-4V/Ti-6.5Al-3.5Mo-1.5Zr-0.3Si has been designed and successfully fabricated by laser melting deposition (LMD) manufacturing technology. Microstructure and chemical composition have been characterized by OM, SEM and EPMA. Micro-hardness and room temperature tensile property have been evaluated as well. Large columnar grains growing epitaxially and traversing multiple deposited layers occur both in Ti-6Al-4V part and Ti-6.5Al-3.5Mo-1.5Zr-0.3Si part. The columnar-to-equiaxed-to-columnar transition happens in the gradient zone because the thermal behavior in and around the molten pool undergoes a transition from unstable state to stable state at the beginning of the LMD process. The microstructure and micro-hardness in gradient zone vary gradually as a function of chemical composition. Both the chemical composition and micro-hardness in gradient zone change abruptly in interlaminations and exhibit a characteristic of steps. According to room temperature tensile results, the fracture takes place in Ti-6Al-4V part when the graded structural material is tested in the longitudinal direction, illustrating that the bonding strength in the gradient zone is stronger than the strength of Ti-6Al-4V in the longitudinal direction. The strength of the graded structural material in the transverse direction falls between that of Ti-6Al-4V in transverse direction and Ti-6.5Al-3.5Mo-1.5Zr-0.3Si in transverse direction. Mechanical behavior of the graded structural material during the room temperature tensile test is analyzed as well. (C) 2014 Elsevier B.V. All rights reserved. ¹Ø¼ü´Ê ×÷Õ߹ؼü´Ê:Laser melting deposition; Graded structural material; Microstructure; Mechanical property KeyWords Plus OWDER DEPOSITION; TITANIUM-VANADIUM; LASER DEPOSITION; EVOLUTION; ALLOY; TI-6AL-4V; PHASE; STEEL; SOLIDIFICATION; FABRICATION×÷ÕßÐÅÏ¢ ͨѶ×÷ÕßµØÖ·: Liu, D (ͨѶ×÷Õß) [ÏÔʾÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ] Beihang Univ, Engn Res Ctr, Minist Educ Laser Direct Mfg Large Met Components, 37 Xueyuan Rd, Beijing 100191, Peoples R China. µØÖ·: [ÏÔʾÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ] [ 1 ] Beihang Univ, Lab Laser Mat Proc & Mfg, Beijing 100191, Peoples R China [ÏÔʾÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ] [ 2 ] Beihang Univ, Engn Res Ctr, Minist Educ Laser Direct Mfg Large Met Components, Beijing 100191, Peoples R China µç×ÓÓʼþµØÖ·:liudong@buaa.edu.cn »ù½ð×ÊÖúÖÂл »ù½ð×ÊÖú»ú¹¹ ÊÚȨºÅ State Key Basic Research Program of China 2011CB606305 ²é¿´»ù½ð×ÊÖúÐÅÏ¢ ³ö°æÉÌ ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND Àà±ð / ·ÖÀà Ñо¿·½Ïò:Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering Web of Science Àà±ð:Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering ÎÄÏ×ÐÅÏ¢ ÎÄÏ×ÀàÐÍ:Article ÓïÖÖ:English Èë²ØºÅ: WOS:000340018300043 ISSN: 0921-5093 eISSN: 1873-4936 ÆäËûÐÅÏ¢ IDS ºÅ: AM7AY Web of Science ºËÐĺϼ¯ÖÐµÄ "ÒýÓõIJο¼ÎÄÏ×": 34 Web of Science ºËÐĺϼ¯ÖÐµÄ "±»ÒýƵ´Î": 2 |
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OWDER DEPOSITION; TITANIUM-VANADIUM; LASER DEPOSITION; EVOLUTION; ALLOY; TI-6AL-4V; PHASE; STEEL; SOLIDIFICATION; FABRICATION