Retained Austenite Characteristics and Stretch-flangeability of High-strength Low-alloy TRIP Type Bainitic Sheet Steels
Retained austenite characteristics and stretch-flangeability in low alloy TRIP type bainitic sheet steels with different silicon and manganese contents were investigated for automotive applications. As increasing silicon and manganese contents, an initial volume fraction of retained austenite film a...
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| Veröffentlicht in: | ISIJ International 2002/04/15, Vol.42(4), pp.450-455 |
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| creator | Sugimoto, Koh-ichi Nakano, Kiyotaka Song, Sung-Moo Kashima, Takahiro |
| description | Retained austenite characteristics and stretch-flangeability in low alloy TRIP type bainitic sheet steels with different silicon and manganese contents were investigated for automotive applications. As increasing silicon and manganese contents, an initial volume fraction of retained austenite film along bainitic ferrite lath boundary was increased in accompany with a decrease in the carbon concentration. An excellent stretch-flangeability was completed in the steels containing a small amount of stable retained austenites (i.e., volume fraction of 2-4 vol% and carbon concentration of more than 1.0 mass%). This was caused by small surface damage on hole-punching and effective strain-induced transformation plasticity of untransformed retained austenite on hole-expanding. When austempered at temperatures less than MS of the steel after intercritical annealing, further superior stretch-flangeability was achieved due to absence of initial blocky martensite, resulting from developments of long shear section and severe plastic flow and difficult void-initiation on hole-punching. |
| doi_str_mv | 10.2355/isijinternational.42.450 |
| format | Article |
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As increasing silicon and manganese contents, an initial volume fraction of retained austenite film along bainitic ferrite lath boundary was increased in accompany with a decrease in the carbon concentration. An excellent stretch-flangeability was completed in the steels containing a small amount of stable retained austenites (i.e., volume fraction of 2-4 vol% and carbon concentration of more than 1.0 mass%). This was caused by small surface damage on hole-punching and effective strain-induced transformation plasticity of untransformed retained austenite on hole-expanding. When austempered at temperatures less than MS of the steel after intercritical annealing, further superior stretch-flangeability was achieved due to absence of initial blocky martensite, resulting from developments of long shear section and severe plastic flow and difficult void-initiation on hole-punching.</description><identifier>ISSN: 0915-1559</identifier><identifier>EISSN: 1347-5460</identifier><identifier>DOI: 10.2355/isijinternational.42.450</identifier><language>eng</language><publisher>Tokyo: The Iron and Steel Institute of Japan</publisher><subject>Applied sciences ; chemical composition ; Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; heat-treatment ; high-strength steel ; Materials science ; Metals. Metallurgy ; Other heat and thermomechanical treatments ; Physics ; retained austenite ; strain-induced transformation ; stretch-flangeability ; Treatment of materials and its effects on microstructure and properties ; TRIP</subject><ispartof>ISIJ International, 2002/04/15, Vol.42(4), pp.450-455</ispartof><rights>The Iron and Steel Institute of Japan</rights><rights>2002 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c609t-4b9c890a7775220ac8d96b6a68cbe9d9f2657ec2ee1388f93c5fc575b157b5cb3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1877,27901,27902</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13700307$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Sugimoto, Koh-ichi</creatorcontrib><creatorcontrib>Nakano, Kiyotaka</creatorcontrib><creatorcontrib>Song, Sung-Moo</creatorcontrib><creatorcontrib>Kashima, Takahiro</creatorcontrib><title>Retained Austenite Characteristics and Stretch-flangeability of High-strength Low-alloy TRIP Type Bainitic Sheet Steels</title><title>ISIJ International</title><addtitle>ISIJ Int.</addtitle><description>Retained austenite characteristics and stretch-flangeability in low alloy TRIP type bainitic sheet steels with different silicon and manganese contents were investigated for automotive applications. As increasing silicon and manganese contents, an initial volume fraction of retained austenite film along bainitic ferrite lath boundary was increased in accompany with a decrease in the carbon concentration. An excellent stretch-flangeability was completed in the steels containing a small amount of stable retained austenites (i.e., volume fraction of 2-4 vol% and carbon concentration of more than 1.0 mass%). This was caused by small surface damage on hole-punching and effective strain-induced transformation plasticity of untransformed retained austenite on hole-expanding. When austempered at temperatures less than MS of the steel after intercritical annealing, further superior stretch-flangeability was achieved due to absence of initial blocky martensite, resulting from developments of long shear section and severe plastic flow and difficult void-initiation on hole-punching.</description><subject>Applied sciences</subject><subject>chemical composition</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Exact sciences and technology</subject><subject>heat-treatment</subject><subject>high-strength steel</subject><subject>Materials science</subject><subject>Metals. Metallurgy</subject><subject>Other heat and thermomechanical treatments</subject><subject>Physics</subject><subject>retained austenite</subject><subject>strain-induced transformation</subject><subject>stretch-flangeability</subject><subject>Treatment of materials and its effects on microstructure and properties</subject><subject>TRIP</subject><issn>0915-1559</issn><issn>1347-5460</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNplkc1uGyEURlHVSrXSvAObdjcuP8MwLFOrbSJZapq4a3QH3_EQEcYFrMhvH1pbySIbWHDu-XQ_CKGcLYVU6qvP_sHHgilC8XOEsGzFslXsHVlw2epGtR17TxbMcNVwpcxHcpmzHxgTbd9KLhfk6Q4L-IhbenXIBaMvSFcTJHDV6nPxLlOIW3pfEhY3NWOAuEMYfPDlSOeRXvvd1OT6Gndlouv5qYEQ5iPd3N3c0s1xj_Rb9fsqovcTYqkmxJA_kQ8jhIyX5_uC_PnxfbO6bta_ft6srtaN65gpTTsY1xsGWmslBAPXb003dND1bkCzNaPolEYnELns-9FIp0antBq40oNyg7wgX07efZr_HjAX--izw1DXwPmQrdCaCc55BfsT6NKcc8LR7pN_hHS0nNl_Zds3ZdtW2Fp2Hf18zoDsIIwJovP5dV5qxiTTlft94h5ygR2-AJBqOwHfBnDTm_8h50OxF9bVP7IY5TPWlaWm</recordid><startdate>20020101</startdate><enddate>20020101</enddate><creator>Sugimoto, Koh-ichi</creator><creator>Nakano, Kiyotaka</creator><creator>Song, Sung-Moo</creator><creator>Kashima, Takahiro</creator><general>The Iron and Steel Institute of Japan</general><general>Iron and Steel Institute of Japan</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20020101</creationdate><title>Retained Austenite Characteristics and Stretch-flangeability of High-strength Low-alloy TRIP Type Bainitic Sheet Steels</title><author>Sugimoto, Koh-ichi ; Nakano, Kiyotaka ; Song, Sung-Moo ; Kashima, Takahiro</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c609t-4b9c890a7775220ac8d96b6a68cbe9d9f2657ec2ee1388f93c5fc575b157b5cb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Applied sciences</topic><topic>chemical composition</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Exact sciences and technology</topic><topic>heat-treatment</topic><topic>high-strength steel</topic><topic>Materials science</topic><topic>Metals. Metallurgy</topic><topic>Other heat and thermomechanical treatments</topic><topic>Physics</topic><topic>retained austenite</topic><topic>strain-induced transformation</topic><topic>stretch-flangeability</topic><topic>Treatment of materials and its effects on microstructure and properties</topic><topic>TRIP</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sugimoto, Koh-ichi</creatorcontrib><creatorcontrib>Nakano, Kiyotaka</creatorcontrib><creatorcontrib>Song, Sung-Moo</creatorcontrib><creatorcontrib>Kashima, Takahiro</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>ISIJ International</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sugimoto, Koh-ichi</au><au>Nakano, Kiyotaka</au><au>Song, Sung-Moo</au><au>Kashima, Takahiro</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Retained Austenite Characteristics and Stretch-flangeability of High-strength Low-alloy TRIP Type Bainitic Sheet Steels</atitle><jtitle>ISIJ International</jtitle><addtitle>ISIJ Int.</addtitle><date>2002-01-01</date><risdate>2002</risdate><volume>42</volume><issue>4</issue><spage>450</spage><epage>455</epage><pages>450-455</pages><issn>0915-1559</issn><eissn>1347-5460</eissn><abstract>Retained austenite characteristics and stretch-flangeability in low alloy TRIP type bainitic sheet steels with different silicon and manganese contents were investigated for automotive applications. As increasing silicon and manganese contents, an initial volume fraction of retained austenite film along bainitic ferrite lath boundary was increased in accompany with a decrease in the carbon concentration. An excellent stretch-flangeability was completed in the steels containing a small amount of stable retained austenites (i.e., volume fraction of 2-4 vol% and carbon concentration of more than 1.0 mass%). This was caused by small surface damage on hole-punching and effective strain-induced transformation plasticity of untransformed retained austenite on hole-expanding. When austempered at temperatures less than MS of the steel after intercritical annealing, further superior stretch-flangeability was achieved due to absence of initial blocky martensite, resulting from developments of long shear section and severe plastic flow and difficult void-initiation on hole-punching.</abstract><cop>Tokyo</cop><pub>The Iron and Steel Institute of Japan</pub><doi>10.2355/isijinternational.42.450</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Applied sciences chemical composition Cross-disciplinary physics: materials science rheology Exact sciences and technology heat-treatment high-strength steel Materials science Metals. Metallurgy Other heat and thermomechanical treatments Physics retained austenite strain-induced transformation stretch-flangeability Treatment of materials and its effects on microstructure and properties TRIP |
| title | Retained Austenite Characteristics and Stretch-flangeability of High-strength Low-alloy TRIP Type Bainitic Sheet Steels |
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