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The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography
[Display omitted] •The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hard...
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Published in: | International journal of fatigue 2019-08, Vol.125, p.210-221 |
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container_title | International journal of fatigue |
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creator | Wu, S.C. Song, Z. Kang, G.Z. Hu, Y.N. Fu, Y.N. |
description | [Display omitted]
•The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hardness and defect size.•The defect tolerance range was defined by Kitagawa-Takahashi diagram.
The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. Modified Murakami equation and Kitagawa-Takahashi diagram were finally established to correlate the fatigue strength with defects, which provides an important reference to assess the joints. |
doi_str_mv | 10.1016/j.ijfatigue.2019.04.002 |
format | article |
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•The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hardness and defect size.•The defect tolerance range was defined by Kitagawa-Takahashi diagram.
The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. Modified Murakami equation and Kitagawa-Takahashi diagram were finally established to correlate the fatigue strength with defects, which provides an important reference to assess the joints.</description><identifier>ISSN: 0142-1123</identifier><identifier>EISSN: 1879-3452</identifier><identifier>DOI: 10.1016/j.ijfatigue.2019.04.002</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Aluminum base alloys ; Computed tomography ; Crack initiation ; Crack propagation ; Crystal defects ; Defects ; Fatigue crack initiation and growth ; Fatigue failure ; Fatigue life ; Fatigue strength ; Fracture mechanics ; Heat treating ; Kitagawa-Takahashi diagram ; Laser beam welding ; Laser hybrid welding ; Materials fatigue ; Microstructure ; Murakami equation ; Railway vehicle components ; S N diagrams ; Surface defects ; Synchrotron radiation ; Tomography ; Welded joints</subject><ispartof>International journal of fatigue, 2019-08, Vol.125, p.210-221</ispartof><rights>2019 Elsevier Ltd</rights><rights>Copyright Elsevier BV Aug 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c409t-faafed8cce3f0addc4e058cab683ad9c0c0a14c5f473ac1e40c3d8cabe7bfa963</citedby><cites>FETCH-LOGICAL-c409t-faafed8cce3f0addc4e058cab683ad9c0c0a14c5f473ac1e40c3d8cabe7bfa963</cites><orcidid>0000-0002-7437-2021</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Wu, S.C.</creatorcontrib><creatorcontrib>Song, Z.</creatorcontrib><creatorcontrib>Kang, G.Z.</creatorcontrib><creatorcontrib>Hu, Y.N.</creatorcontrib><creatorcontrib>Fu, Y.N.</creatorcontrib><title>The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography</title><title>International journal of fatigue</title><description>[Display omitted]
•The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hardness and defect size.•The defect tolerance range was defined by Kitagawa-Takahashi diagram.
The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. Modified Murakami equation and Kitagawa-Takahashi diagram were finally established to correlate the fatigue strength with defects, which provides an important reference to assess the joints.</description><subject>Aluminum base alloys</subject><subject>Computed tomography</subject><subject>Crack initiation</subject><subject>Crack propagation</subject><subject>Crystal defects</subject><subject>Defects</subject><subject>Fatigue crack initiation and growth</subject><subject>Fatigue failure</subject><subject>Fatigue life</subject><subject>Fatigue strength</subject><subject>Fracture mechanics</subject><subject>Heat treating</subject><subject>Kitagawa-Takahashi diagram</subject><subject>Laser beam welding</subject><subject>Laser hybrid welding</subject><subject>Materials fatigue</subject><subject>Microstructure</subject><subject>Murakami equation</subject><subject>Railway vehicle components</subject><subject>S N diagrams</subject><subject>Surface defects</subject><subject>Synchrotron radiation</subject><subject>Tomography</subject><subject>Welded joints</subject><issn>0142-1123</issn><issn>1879-3452</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFkMtOwzAQRS0EEqXwDVhinTBOnKZeVoiXQGJTJHbW1B43DjQudgrK35OqiC2rWcw9dzSHsUsBuQAxu25z3zrs_XpHeQFC5SBzgOKITcS8Vlkpq-KYTUDIIhOiKE_ZWUotACioqwlzy4b4k-9xjd-YLfEdG0yN57-N3HpcR9zwPvBmWEVv-Td9WLJ8saihAt4G3_WJf3nkaehME0MfQ8ffsojDCG3CSG-b4ZydOPxIdPE7p-z17nZ585A9v9w_3iyeMyNB9ZlDdGTnxlDpAK01kqCaG1zN5iVaZcAACmkqJ-sSjSAJprT7PdUrh2pWTtnVoXcbw-eOUq_bsIvdeFIXRaVKqYSqx1R9SJkYUork9Db6DcZBC9B7qbrVf1L1XqoGqUepI7k4kDQ-8eUp6mQ8dYasj2R6bYP_t-MHe_-G6Q</recordid><startdate>201908</startdate><enddate>201908</enddate><creator>Wu, S.C.</creator><creator>Song, Z.</creator><creator>Kang, G.Z.</creator><creator>Hu, Y.N.</creator><creator>Fu, Y.N.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0002-7437-2021</orcidid></search><sort><creationdate>201908</creationdate><title>The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography</title><author>Wu, S.C. ; Song, Z. ; Kang, G.Z. ; Hu, Y.N. ; Fu, Y.N.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c409t-faafed8cce3f0addc4e058cab683ad9c0c0a14c5f473ac1e40c3d8cabe7bfa963</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Aluminum base alloys</topic><topic>Computed tomography</topic><topic>Crack initiation</topic><topic>Crack propagation</topic><topic>Crystal defects</topic><topic>Defects</topic><topic>Fatigue crack initiation and growth</topic><topic>Fatigue failure</topic><topic>Fatigue life</topic><topic>Fatigue strength</topic><topic>Fracture mechanics</topic><topic>Heat treating</topic><topic>Kitagawa-Takahashi diagram</topic><topic>Laser beam welding</topic><topic>Laser hybrid welding</topic><topic>Materials fatigue</topic><topic>Microstructure</topic><topic>Murakami equation</topic><topic>Railway vehicle components</topic><topic>S N diagrams</topic><topic>Surface defects</topic><topic>Synchrotron radiation</topic><topic>Tomography</topic><topic>Welded joints</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wu, S.C.</creatorcontrib><creatorcontrib>Song, Z.</creatorcontrib><creatorcontrib>Kang, G.Z.</creatorcontrib><creatorcontrib>Hu, Y.N.</creatorcontrib><creatorcontrib>Fu, Y.N.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>International journal of fatigue</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wu, S.C.</au><au>Song, Z.</au><au>Kang, G.Z.</au><au>Hu, Y.N.</au><au>Fu, Y.N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography</atitle><jtitle>International journal of fatigue</jtitle><date>2019-08</date><risdate>2019</risdate><volume>125</volume><spage>210</spage><epage>221</epage><pages>210-221</pages><issn>0142-1123</issn><eissn>1879-3452</eissn><abstract>[Display omitted]
•The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hardness and defect size.•The defect tolerance range was defined by Kitagawa-Takahashi diagram.
The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. Modified Murakami equation and Kitagawa-Takahashi diagram were finally established to correlate the fatigue strength with defects, which provides an important reference to assess the joints.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijfatigue.2019.04.002</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-7437-2021</orcidid></addata></record> |
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subjects | Aluminum base alloys Computed tomography Crack initiation Crack propagation Crystal defects Defects Fatigue crack initiation and growth Fatigue failure Fatigue life Fatigue strength Fracture mechanics Heat treating Kitagawa-Takahashi diagram Laser beam welding Laser hybrid welding Materials fatigue Microstructure Murakami equation Railway vehicle components S N diagrams Surface defects Synchrotron radiation Tomography Welded joints |
title | The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography |
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