Microstructural effects on high-cycle fatigue-crack initiation in A356.2 casting alloy
The effects of various microconstituents on crack initiation and propagation in high-cycle fatigue (HCF) were investigated in an aluminum casting alloy (A356.2). Fatigue cracking was induced in both axial and bending loading conditions at strain/stress ratios of -1, 0.1, and 0.2. The secondary dendr...
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| Veröffentlicht in: | Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Physical Metallurgy and Materials Science, 1999-10, Vol.30 (10), p.2659-2666 |
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| description | The effects of various microconstituents on crack initiation and propagation in high-cycle fatigue (HCF) were investigated in an aluminum casting alloy (A356.2). Fatigue cracking was induced in both axial and bending loading conditions at strain/stress ratios of -1, 0.1, and 0.2. The secondary dendrite arm spacing (SDAS) and porosity (maximum size and density distribution) were quantified in the directionally solidified casting alloy. Using scanning electron microscopy, we observed that cracks initiate at near-surface porosity, at oxides, and within the eutectic microconstituents, depending on the SDAS. When the SDAS is greater than 25-28 microns, the fatigue cracks initiate from surface and subsurface porosity. When the SDAS is less than 25-28 microns, the fatigue cracks initiate from the interdendritic eutectic constituents, where the silicon particles are segregated. Fatigue cracks initiated at oxide inclusions whenever they were near the surface, regardless of the SDAS. The fatigue life of a specimen whose crack initiated at a large eutectic constituent was about equal to that when the crack initiated at a pore or oxide of comparable size. (Author) |
| doi_str_mv | 10.1007/s11661-999-0306-3 |
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R ; CHEN, W</creator><creatorcontrib>ZHANG, B ; POIRIER, D. R ; CHEN, W ; Univ. of Arizona, Tucson, AZ (US)</creatorcontrib><description>The effects of various microconstituents on crack initiation and propagation in high-cycle fatigue (HCF) were investigated in an aluminum casting alloy (A356.2). Fatigue cracking was induced in both axial and bending loading conditions at strain/stress ratios of -1, 0.1, and 0.2. The secondary dendrite arm spacing (SDAS) and porosity (maximum size and density distribution) were quantified in the directionally solidified casting alloy. Using scanning electron microscopy, we observed that cracks initiate at near-surface porosity, at oxides, and within the eutectic microconstituents, depending on the SDAS. When the SDAS is greater than 25-28 microns, the fatigue cracks initiate from surface and subsurface porosity. When the SDAS is less than 25-28 microns, the fatigue cracks initiate from the interdendritic eutectic constituents, where the silicon particles are segregated. Fatigue cracks initiated at oxide inclusions whenever they were near the surface, regardless of the SDAS. The fatigue life of a specimen whose crack initiated at a large eutectic constituent was about equal to that when the crack initiated at a pore or oxide of comparable size. (Author)</description><identifier>ISSN: 1073-5623</identifier><identifier>EISSN: 1543-1940</identifier><identifier>DOI: 10.1007/s11661-999-0306-3</identifier><identifier>CODEN: MMTAEB</identifier><language>eng</language><publisher>New York, NY: Springer</publisher><subject>ALUMINIUM BASE ALLOYS ; Applied sciences ; CHEMICAL COMPOSITION ; CRACK PROPAGATION ; Cross-disciplinary physics: materials science; rheology ; DENDRITES ; Exact sciences and technology ; EXPERIMENTAL DATA ; FATIGUE ; Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure ; Fatigue, embrittlement, and fracture ; INCLUSIONS ; MATERIALS SCIENCE ; Metals. Metallurgy ; MICROSTRUCTURE ; Physics ; POROSITY ; SCANNING ELECTRON MICROSCOPY ; Treatment of materials and its effects on microstructure and properties</subject><ispartof>Metallurgical and Materials Transactions. 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R</creatorcontrib><creatorcontrib>CHEN, W</creatorcontrib><creatorcontrib>Univ. of Arizona, Tucson, AZ (US)</creatorcontrib><title>Microstructural effects on high-cycle fatigue-crack initiation in A356.2 casting alloy</title><title>Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science</title><description>The effects of various microconstituents on crack initiation and propagation in high-cycle fatigue (HCF) were investigated in an aluminum casting alloy (A356.2). Fatigue cracking was induced in both axial and bending loading conditions at strain/stress ratios of -1, 0.1, and 0.2. The secondary dendrite arm spacing (SDAS) and porosity (maximum size and density distribution) were quantified in the directionally solidified casting alloy. Using scanning electron microscopy, we observed that cracks initiate at near-surface porosity, at oxides, and within the eutectic microconstituents, depending on the SDAS. When the SDAS is greater than 25-28 microns, the fatigue cracks initiate from surface and subsurface porosity. When the SDAS is less than 25-28 microns, the fatigue cracks initiate from the interdendritic eutectic constituents, where the silicon particles are segregated. Fatigue cracks initiated at oxide inclusions whenever they were near the surface, regardless of the SDAS. The fatigue life of a specimen whose crack initiated at a large eutectic constituent was about equal to that when the crack initiated at a pore or oxide of comparable size. 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R ; CHEN, W</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c424t-b2c457652d47eb13b555ce5e552ae5f94e2e607f56c1bec87ad7c1e4d48ab3133</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>ALUMINIUM BASE ALLOYS</topic><topic>Applied sciences</topic><topic>CHEMICAL COMPOSITION</topic><topic>CRACK PROPAGATION</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>DENDRITES</topic><topic>Exact sciences and technology</topic><topic>EXPERIMENTAL DATA</topic><topic>FATIGUE</topic><topic>Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure</topic><topic>Fatigue, embrittlement, and fracture</topic><topic>INCLUSIONS</topic><topic>MATERIALS SCIENCE</topic><topic>Metals. Metallurgy</topic><topic>MICROSTRUCTURE</topic><topic>Physics</topic><topic>POROSITY</topic><topic>SCANNING ELECTRON MICROSCOPY</topic><topic>Treatment of materials and its effects on microstructure and properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ZHANG, B</creatorcontrib><creatorcontrib>POIRIER, D. 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A, Physical Metallurgy and Materials Science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>ZHANG, B</au><au>POIRIER, D. R</au><au>CHEN, W</au><aucorp>Univ. of Arizona, Tucson, AZ (US)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microstructural effects on high-cycle fatigue-crack initiation in A356.2 casting alloy</atitle><jtitle>Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science</jtitle><date>1999-10-01</date><risdate>1999</risdate><volume>30</volume><issue>10</issue><spage>2659</spage><epage>2666</epage><pages>2659-2666</pages><issn>1073-5623</issn><eissn>1543-1940</eissn><coden>MMTAEB</coden><abstract>The effects of various microconstituents on crack initiation and propagation in high-cycle fatigue (HCF) were investigated in an aluminum casting alloy (A356.2). Fatigue cracking was induced in both axial and bending loading conditions at strain/stress ratios of -1, 0.1, and 0.2. The secondary dendrite arm spacing (SDAS) and porosity (maximum size and density distribution) were quantified in the directionally solidified casting alloy. Using scanning electron microscopy, we observed that cracks initiate at near-surface porosity, at oxides, and within the eutectic microconstituents, depending on the SDAS. When the SDAS is greater than 25-28 microns, the fatigue cracks initiate from surface and subsurface porosity. When the SDAS is less than 25-28 microns, the fatigue cracks initiate from the interdendritic eutectic constituents, where the silicon particles are segregated. Fatigue cracks initiated at oxide inclusions whenever they were near the surface, regardless of the SDAS. The fatigue life of a specimen whose crack initiated at a large eutectic constituent was about equal to that when the crack initiated at a pore or oxide of comparable size. (Author)</abstract><cop>New York, NY</cop><pub>Springer</pub><doi>10.1007/s11661-999-0306-3</doi><tpages>8</tpages></addata></record> |
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| ispartof | Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 1999-10, Vol.30 (10), p.2659-2666 |
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| subjects | ALUMINIUM BASE ALLOYS Applied sciences CHEMICAL COMPOSITION CRACK PROPAGATION Cross-disciplinary physics: materials science rheology DENDRITES Exact sciences and technology EXPERIMENTAL DATA FATIGUE Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure Fatigue, embrittlement, and fracture INCLUSIONS MATERIALS SCIENCE Metals. Metallurgy MICROSTRUCTURE Physics POROSITY SCANNING ELECTRON MICROSCOPY Treatment of materials and its effects on microstructure and properties |
| title | Microstructural effects on high-cycle fatigue-crack initiation in A356.2 casting alloy |
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