[1]º«çæç÷,ñãɺÄÈ,ǿΰ,µÈ.LZ91þ﮺Ͻ𱡰庸½Ó¹¤ÒÕ¼°½ÓÍ·×éÖ¯ÐÔÄÜÑо¿[J].º¸¹Ü,2023,46(2):6-11.[doi:10.19291/j.cnki.1001-3938.2023.02.002]
¡¡HAN Keqi,XU Shanna,QIANG Wei,et al.Study on Welding Process and Microstructure and Properties of LZ91 Magnesium-lithium Alloy[J].,2023,46(2):6-11.[doi:10.19291/j.cnki.1001-3938.2023.02.002]
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46
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6-11
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2023-02-28

ÎÄÕÂÐÅÏ¢/Info

Title:
Study on Welding Process and Microstructure and Properties of LZ91 Magnesium-lithium Alloy
ÎÄÕ±àºÅ:
10.19291/j.cnki.1001-3938.2023.02.002
×÷Õß:
º«çæç÷ñãɺÄÈǿΰ¸ßÃÀÁõ¸Û
1. Î÷°²Ê¯ÓÍ´óѧ ²ÄÁÏ¿ÆѧÓ빤³ÌѧԺ£¬Î÷°² 710065£» 2. Î÷°²Èȹ¤Ñо¿ÔºÓÐÏÞ¹«Ë¾£¬Î÷°² 710032
Author(s):
HAN Keqi XU Shanna QIANG Wei GAO Mei LIU Gang
1. School of Materials Science and Engineering, Xi¡¯an Shiyou University, Xi¡¯an 710065, China; 2. Xi¡¯an Thermal Power Research Institute Co., Ltd., Xi¡¯an 710032, China
¹Ø¼ü´Ê:
þ﮺ϽðTIGº¸½Ó΢¹Û½á¹¹Á¦Ñ§ÐÔÄÜ
Keywords:
magnesium-lithium alloy TIG welding microstructure mechanical property
·ÖÀàºÅ:
TG444.74
DOI:
10.19291/j.cnki.1001-3938.2023.02.002
ÎÄÏ×±êÖ¾Âë:
A
ÕªÒª:
ΪÁËÑо¿º¸½ÓµçÁ÷¶ÔLZ91þ﮺Ͻ𺸽ӽÓÍ·×éÖ¯ºÍÐÔÄܵÄÓ°Ï죬²ÉÓÃÈýÖÖ²»Í¬º¸½ÓµçÁ÷£¨60 A¡¢70 A¡¢80 A£©µÄÂö³åÎÙ¼«ë²»¡º¸¶Ô1 mmºñµÄLZ91þ﮺Ͻ𱡰å½øÐÐÁ˺¸½Ó£¬²¢ÀûÓýðÏà¹âѧÏÔ΢¾µ¡¢É¨Ãèµç×ÓÏÔ΢¾µ¡¢XRD¡¢ÏÔ΢Ӳ¶ÈÒǺÍÀ­ÉìÊÔÑé¶Ôº¸½Ó½ÓÍ·µÄ΢¹Û½á¹¹ºÍÁ¦Ñ§ÐÔÄܽøÐÐÁ˱íÕ÷£¬ÀûÓõ绯ѧ¹¤×÷Õ¾²âÊÔº¸·ìµÄÄ͸¯Ê´ÄÜÁ¦¡£½á¹û±íÃ÷£ºÈýÖÖº¸½ÓµçÁ÷Ìõ¼þÏ£¬º¸½Ó½ÓÍ·ÈÛºÏÁ¼ºÃ£¬¾ùÎÞÃ÷ÏÔÁÑÎÆ¡¢Æø¿×µÈº¸½ÓȱÏÝ£»ÆäÖÐ70 A¡¢80 Aº¸½ÓµçÁ÷µÄº¸·ìÇø½ÏÈÈÓ°ÏìÇø¾ßÓиüСµÄ¾§Á££»Ó²¶ÈÒÔº¸·ìÇø×î¸ß£¬ÈÈÓ°ÏìÇø´ÎÖ®£¬¾ù¸ßÓÚĸ²Ä£»º¸½Ó½ÓÍ·µÄ¿¹À­Ç¿¶È¾ù¸ßÓÚĸ²Ä£¬ÆäÖк¸½ÓµçÁ÷70 AʱÀ­ÉìÐÔÄÜ×î¼Ñ£¬¿¹À­Ç¿¶È´ïµ½×î´óÖµ125.20 MPa£¬É쳤Âʱ£³ÖÔÚĸ²ÄµÄ35 %ÒÔÉÏ£»¾­µç»¯Ñ§²âÊÔ£¬ÔÚ70 Aº¸½ÓµçÁ÷Ìõ¼þϵõ½µÄº¸·ìÄ͸¯Ê´ÄÜÁ¦×îÇ¿¡£
Abstract:
In order to study the effect of welding current on the microstructure and properties of LZ91 magnesium?ithium alloy welded joints, three different welding current (60 A, 70 A, 80 A) pulsed tungsten argon arc welding was used to weld 1 mm thick LZ91 magnesium?ithium alloy sheet. The microstructure and mechanical properties of the welded joints were characterized by metallographic optical microscope, scanning electron microscopy, XRD, microhardness tester and tensile test. The corrosion resistance of each weld is tested by electrochemistry station. The results show that under the three welding current conditions, the fusion is good, dendrites are generated, and there are no obvious cracks, pores and other welding defects. The 70 A and 80A weld zones have smaller grains than the heat affected zone. The hardness of weld zone is the highest, followed by heat affected zone, which is higher than that of base metal. The tensile strength of the welded joint is higher than that of the base metal, among which the welding current 70 A is the best tensile strength, the maximum tensile strength is 125.20 MPa, and the elongation is more than 35 % of the base metal. The electrochemical test shows that the corrosion resistance of the weld under 70 A is optimal.

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