Effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature of 9CrWVTiN steels
The effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature (DBTT) of 9CrWVTiN steels have been studied. The results show that Ti addition reduces austenite grain size and martensitic lath, and moderate Ti (
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| Veröffentlicht in: | Materials & design 2015-12, Vol.88, p.675-682 |
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| creator | Zhang, Ying Yu, Chi Zhou, Tong Liu, Dawei Fang, Xuanwei Li, Heping Suo, Jinping |
| description | The effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature (DBTT) of 9CrWVTiN steels have been studied. The results show that Ti addition reduces austenite grain size and martensitic lath, and moderate Ti ( |
| doi_str_mv | 10.1016/j.matdes.2015.09.056 |
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•Moderate Ti (<0.018%) content can refine the microstructure of 9CrWVTiN steel•Twice-quenching treatment can refine microstructure and decrease ductile brittle transition temperature•Ti addition increases ductile brittle transition temperature greatly regardless of the refinement of microstructure•Formation of quadrate (Ti,V)(C,N) particles and reduced quantity of fine V(C,N) particles are main reasons for high DBTT</description><identifier>ISSN: 0264-1275</identifier><identifier>EISSN: 1873-4197</identifier><identifier>DOI: 10.1016/j.matdes.2015.09.056</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>9CrWVTiN steel ; Cooling ; Crack initiation ; Ductile brittle transition ; Ductile brittle transition temperature ; Heat treatment ; Microstructure ; Microstructure refinement ; Precipitates ; Precipitation ; Steels ; Titanium</subject><ispartof>Materials & design, 2015-12, Vol.88, p.675-682</ispartof><rights>2015 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c339t-87ce8bf782139dcacb84cd73388b73c91b9e767b279b66a75392f8321baf9953</citedby><cites>FETCH-LOGICAL-c339t-87ce8bf782139dcacb84cd73388b73c91b9e767b279b66a75392f8321baf9953</cites><orcidid>0000-0003-3917-5345</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>Zhang, Ying</creatorcontrib><creatorcontrib>Yu, Chi</creatorcontrib><creatorcontrib>Zhou, Tong</creatorcontrib><creatorcontrib>Liu, Dawei</creatorcontrib><creatorcontrib>Fang, Xuanwei</creatorcontrib><creatorcontrib>Li, Heping</creatorcontrib><creatorcontrib>Suo, Jinping</creatorcontrib><title>Effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature of 9CrWVTiN steels</title><title>Materials & design</title><description>The effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature (DBTT) of 9CrWVTiN steels have been studied. The results show that Ti addition reduces austenite grain size and martensitic lath, and moderate Ti (<0.018%) content reduces the precipitates size. Microstructure, especially the coarse M23C6 precipitates is remarkably refined by twice quenching and by consuming C through preferential precipitation of MX precipitates in the furnace cooling period, thus contributing to the decrease of DBTT compared with quenching–tempering process. However, DBTT increases with increasing Ti content, and the increased DBTT reaches to as high as 36°C compared with steel without Ti regardless of the refinement of microstructure. Through precipitate analyses, we find that, Ti strongly interferes with the precipitation of V(C,N). Ti(C,N) hardly exists in matrix alone. Instead, it acts as the core of quadrate (Ti,V)(C,N) particle. Big stress concentrations at the corners of coarse quadrate (Ti,V)(C,N) precipitates make them as crack initiators during impact tests, thus deteriorating the toughness. Also, formation of complex (Ti,V)(C,N) particles reduces the amounts of V, N, and C available for adequate fine V(C,N) particle precipitation. These two factors are the main reasons for high DBTT generated by Ti addition.
[Display omitted]
•Moderate Ti (<0.018%) content can refine the microstructure of 9CrWVTiN steel•Twice-quenching treatment can refine microstructure and decrease ductile brittle transition temperature•Ti addition increases ductile brittle transition temperature greatly regardless of the refinement of microstructure•Formation of quadrate (Ti,V)(C,N) particles and reduced quantity of fine V(C,N) particles are main reasons for high DBTT</description><subject>9CrWVTiN steel</subject><subject>Cooling</subject><subject>Crack initiation</subject><subject>Ductile brittle transition</subject><subject>Ductile brittle transition temperature</subject><subject>Heat treatment</subject><subject>Microstructure</subject><subject>Microstructure refinement</subject><subject>Precipitates</subject><subject>Precipitation</subject><subject>Steels</subject><subject>Titanium</subject><issn>0264-1275</issn><issn>1873-4197</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp9kDtPwzAUhS0EEqXwDxg8siT4kcT2goQqXlIFSwSj5Tg31FUexXZBjPxz3JaZ6dzhnHN1PoQuKckpodX1Oh9MbCHkjNAyJyonZXWEZlQKnhVUiWM0I6wqMspEeYrOQlgTwpjgxQz93HUd2Bjw1OHaYTO22OD45SxkH1sY7cqN7zh6MHGAMeJpxHEFeHDWTyH6rY1bD_tUm27XA268izFp9GYMLrpdAoYNeLO3pjdq4d9ea_eMQwTowzk66Uwf4OJP56i-v6sXj9ny5eFpcbvMLOcqZlJYkE0nJKNctdbYRha2FZxL2QhuFW0UiEo0TKimqowouWKd5Iw2plOq5HN0dajd-CktC1EPLljoezPCtA2aCiEJE6QskrU4WHcjg4dOb7wbjP_WlOgdcL3WB-B6B1wTpRPwFLs5xNIo-HTgdbAuIYTW-YRYt5P7v-AXhvKNvw</recordid><startdate>20151225</startdate><enddate>20151225</enddate><creator>Zhang, Ying</creator><creator>Yu, Chi</creator><creator>Zhou, Tong</creator><creator>Liu, Dawei</creator><creator>Fang, Xuanwei</creator><creator>Li, Heping</creator><creator>Suo, Jinping</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0003-3917-5345</orcidid></search><sort><creationdate>20151225</creationdate><title>Effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature of 9CrWVTiN steels</title><author>Zhang, Ying ; Yu, Chi ; Zhou, Tong ; Liu, Dawei ; Fang, Xuanwei ; Li, Heping ; Suo, Jinping</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c339t-87ce8bf782139dcacb84cd73388b73c91b9e767b279b66a75392f8321baf9953</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>9CrWVTiN steel</topic><topic>Cooling</topic><topic>Crack initiation</topic><topic>Ductile brittle transition</topic><topic>Ductile brittle transition temperature</topic><topic>Heat treatment</topic><topic>Microstructure</topic><topic>Microstructure refinement</topic><topic>Precipitates</topic><topic>Precipitation</topic><topic>Steels</topic><topic>Titanium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Ying</creatorcontrib><creatorcontrib>Yu, Chi</creatorcontrib><creatorcontrib>Zhou, Tong</creatorcontrib><creatorcontrib>Liu, Dawei</creatorcontrib><creatorcontrib>Fang, Xuanwei</creatorcontrib><creatorcontrib>Li, Heping</creatorcontrib><creatorcontrib>Suo, Jinping</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Materials & design</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Ying</au><au>Yu, Chi</au><au>Zhou, Tong</au><au>Liu, Dawei</au><au>Fang, Xuanwei</au><au>Li, Heping</au><au>Suo, Jinping</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature of 9CrWVTiN steels</atitle><jtitle>Materials & design</jtitle><date>2015-12-25</date><risdate>2015</risdate><volume>88</volume><spage>675</spage><epage>682</epage><pages>675-682</pages><issn>0264-1275</issn><eissn>1873-4197</eissn><abstract>The effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature (DBTT) of 9CrWVTiN steels have been studied. The results show that Ti addition reduces austenite grain size and martensitic lath, and moderate Ti (<0.018%) content reduces the precipitates size. Microstructure, especially the coarse M23C6 precipitates is remarkably refined by twice quenching and by consuming C through preferential precipitation of MX precipitates in the furnace cooling period, thus contributing to the decrease of DBTT compared with quenching–tempering process. However, DBTT increases with increasing Ti content, and the increased DBTT reaches to as high as 36°C compared with steel without Ti regardless of the refinement of microstructure. Through precipitate analyses, we find that, Ti strongly interferes with the precipitation of V(C,N). Ti(C,N) hardly exists in matrix alone. Instead, it acts as the core of quadrate (Ti,V)(C,N) particle. Big stress concentrations at the corners of coarse quadrate (Ti,V)(C,N) precipitates make them as crack initiators during impact tests, thus deteriorating the toughness. Also, formation of complex (Ti,V)(C,N) particles reduces the amounts of V, N, and C available for adequate fine V(C,N) particle precipitation. These two factors are the main reasons for high DBTT generated by Ti addition.
[Display omitted]
•Moderate Ti (<0.018%) content can refine the microstructure of 9CrWVTiN steel•Twice-quenching treatment can refine microstructure and decrease ductile brittle transition temperature•Ti addition increases ductile brittle transition temperature greatly regardless of the refinement of microstructure•Formation of quadrate (Ti,V)(C,N) particles and reduced quantity of fine V(C,N) particles are main reasons for high DBTT</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.matdes.2015.09.056</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0003-3917-5345</orcidid></addata></record> |
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| subjects | 9CrWVTiN steel Cooling Crack initiation Ductile brittle transition Ductile brittle transition temperature Heat treatment Microstructure Microstructure refinement Precipitates Precipitation Steels Titanium |
| title | Effects of Ti and a twice-quenching treatment on the microstructure and ductile brittle transition temperature of 9CrWVTiN steels |
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