Continuous cooling transformation diagram and mechanical properties in weld coarse-grain heat-affected zone of API X70 steel
In the present work, continuous cooling transformation (CCT) of coarse-grained heat-affected zone (CGHAZ) and simulation of Charpy-sized impact specimens were performed using a Gleeble 3800 thermomechanical simulator. Results obtained from the dilation studies show significant effect of cooling rate...
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| Veröffentlicht in: | Sadhana (Bangalore) 2021-06, Vol.46 (2), Article 88 |
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| creator | Naik, Ajit Kumar Roshan, Rakesh Arora, Kanwer Singh Shajan, Nikhil Mishra, Subash Chandra |
| description | In the present work, continuous cooling transformation (CCT) of coarse-grained heat-affected zone (CGHAZ) and simulation of Charpy-sized impact specimens were performed using a Gleeble 3800 thermomechanical simulator. Results obtained from the dilation studies show significant effect of cooling rates on microstructure and low-temperature (–20 °C) Charpy impact toughness. Phase transformation temperatures (
A
r3
and
A
r1
) and impact toughness decreased while hardness and amount of bainite increased with increasing cooling rates. At slow cooling condition (< 5 °Cs
–1
) quasi-polygonal ferrite and pearlite phases were observed in the microstructure. At medium cooling rate (5–25 °Cs
–1
), bainite and quasi-polygonal ferrite were obtained in the microstructure. For still faster cooling rates, microstructure was completely bainitic in nature. The microstructures were confirmed by hardness measurement where the hardness value for lower, medium and high cooling rates were 191–196, 213–214 and 234–253 HV, respectively. Charpy impact toughness increased with decrease in cooling rate due to the presence of softer ferrite phase. |
| doi_str_mv | 10.1007/s12046-021-01623-2 |
| format | Article |
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A
r3
and
A
r1
) and impact toughness decreased while hardness and amount of bainite increased with increasing cooling rates. At slow cooling condition (< 5 °Cs
–1
) quasi-polygonal ferrite and pearlite phases were observed in the microstructure. At medium cooling rate (5–25 °Cs
–1
), bainite and quasi-polygonal ferrite were obtained in the microstructure. For still faster cooling rates, microstructure was completely bainitic in nature. The microstructures were confirmed by hardness measurement where the hardness value for lower, medium and high cooling rates were 191–196, 213–214 and 234–253 HV, respectively. Charpy impact toughness increased with decrease in cooling rate due to the presence of softer ferrite phase.</description><identifier>ISSN: 0256-2499</identifier><identifier>EISSN: 0973-7677</identifier><identifier>DOI: 10.1007/s12046-021-01623-2</identifier><language>eng</language><publisher>New Delhi: Springer India</publisher><subject>Bainite ; Cooling effects ; Cooling rate ; Engineering ; Ferrite ; Hardness measurement ; Heat affected zone ; Heat treating ; High strength low alloy steels ; Impact strength ; Low temperature ; Mechanical properties ; Microstructure ; Pearlite ; Phase transitions ; Polygons ; Temperature ; Thermal simulation ; Thermal simulators ; Toughness ; Transformation temperature</subject><ispartof>Sadhana (Bangalore), 2021-06, Vol.46 (2), Article 88</ispartof><rights>Indian Academy of Sciences 2021</rights><rights>Indian Academy of Sciences 2021.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c319t-d58513bf0d044cdd248736bea47dcd7ae2ca1234962d6292736e3052bef497df3</citedby><cites>FETCH-LOGICAL-c319t-d58513bf0d044cdd248736bea47dcd7ae2ca1234962d6292736e3052bef497df3</cites><orcidid>0000-0002-6792-3956</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s12046-021-01623-2$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s12046-021-01623-2$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Naik, Ajit Kumar</creatorcontrib><creatorcontrib>Roshan, Rakesh</creatorcontrib><creatorcontrib>Arora, Kanwer Singh</creatorcontrib><creatorcontrib>Shajan, Nikhil</creatorcontrib><creatorcontrib>Mishra, Subash Chandra</creatorcontrib><title>Continuous cooling transformation diagram and mechanical properties in weld coarse-grain heat-affected zone of API X70 steel</title><title>Sadhana (Bangalore)</title><addtitle>Sādhanā</addtitle><description>In the present work, continuous cooling transformation (CCT) of coarse-grained heat-affected zone (CGHAZ) and simulation of Charpy-sized impact specimens were performed using a Gleeble 3800 thermomechanical simulator. Results obtained from the dilation studies show significant effect of cooling rates on microstructure and low-temperature (–20 °C) Charpy impact toughness. Phase transformation temperatures (
A
r3
and
A
r1
) and impact toughness decreased while hardness and amount of bainite increased with increasing cooling rates. At slow cooling condition (< 5 °Cs
–1
) quasi-polygonal ferrite and pearlite phases were observed in the microstructure. At medium cooling rate (5–25 °Cs
–1
), bainite and quasi-polygonal ferrite were obtained in the microstructure. For still faster cooling rates, microstructure was completely bainitic in nature. The microstructures were confirmed by hardness measurement where the hardness value for lower, medium and high cooling rates were 191–196, 213–214 and 234–253 HV, respectively. Charpy impact toughness increased with decrease in cooling rate due to the presence of softer ferrite phase.</description><subject>Bainite</subject><subject>Cooling effects</subject><subject>Cooling rate</subject><subject>Engineering</subject><subject>Ferrite</subject><subject>Hardness measurement</subject><subject>Heat affected zone</subject><subject>Heat treating</subject><subject>High strength low alloy steels</subject><subject>Impact strength</subject><subject>Low temperature</subject><subject>Mechanical properties</subject><subject>Microstructure</subject><subject>Pearlite</subject><subject>Phase transitions</subject><subject>Polygons</subject><subject>Temperature</subject><subject>Thermal simulation</subject><subject>Thermal simulators</subject><subject>Toughness</subject><subject>Transformation temperature</subject><issn>0256-2499</issn><issn>0973-7677</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp9kEFrGzEQhZfSQp00f6AnQc5KpZFW8h6NSZpAIDkkkJuQpZG9Zi05kkxIyY-vGgdy62mGmffeDF_X_eTsgjOmfxUOTCrKgFPGFQgKX7oZG7SgWmn9tfXQKwpyGL53J6VsGQPN5mLWvS1TrGM8pEMhLqVpjGtSs40lpLyzdUyR-NGus90RGz3ZodvYODo7kX1Oe8x1xELGSF5w8i3A5oK0qdtkg7ZSGwK6ip78SRFJCmRxf0OeNCOlIk4_um_BTgXPPupp93h1-bC8prd3v2-Wi1vqBB8q9f2852IVmGdSOu9BzrVQK7RSe-e1RXCWg5CDAq9ggLZEwXpYYZCD9kGcdufH3Pbz8wFLNdt0yLGdNNDzQSgl57Kp4KhyOZWSMZh9Hnc2vxrOzD_K5kjZNMrmnbKBZhJHU2niuMb8Gf0f11-7DIDh</recordid><startdate>20210601</startdate><enddate>20210601</enddate><creator>Naik, Ajit Kumar</creator><creator>Roshan, Rakesh</creator><creator>Arora, Kanwer Singh</creator><creator>Shajan, Nikhil</creator><creator>Mishra, Subash Chandra</creator><general>Springer India</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0002-6792-3956</orcidid></search><sort><creationdate>20210601</creationdate><title>Continuous cooling transformation diagram and mechanical properties in weld coarse-grain heat-affected zone of API X70 steel</title><author>Naik, Ajit Kumar ; Roshan, Rakesh ; Arora, Kanwer Singh ; Shajan, Nikhil ; Mishra, Subash Chandra</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c319t-d58513bf0d044cdd248736bea47dcd7ae2ca1234962d6292736e3052bef497df3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Bainite</topic><topic>Cooling effects</topic><topic>Cooling rate</topic><topic>Engineering</topic><topic>Ferrite</topic><topic>Hardness measurement</topic><topic>Heat affected zone</topic><topic>Heat treating</topic><topic>High strength low alloy steels</topic><topic>Impact strength</topic><topic>Low temperature</topic><topic>Mechanical properties</topic><topic>Microstructure</topic><topic>Pearlite</topic><topic>Phase transitions</topic><topic>Polygons</topic><topic>Temperature</topic><topic>Thermal simulation</topic><topic>Thermal simulators</topic><topic>Toughness</topic><topic>Transformation temperature</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Naik, Ajit Kumar</creatorcontrib><creatorcontrib>Roshan, Rakesh</creatorcontrib><creatorcontrib>Arora, Kanwer Singh</creatorcontrib><creatorcontrib>Shajan, Nikhil</creatorcontrib><creatorcontrib>Mishra, Subash Chandra</creatorcontrib><collection>CrossRef</collection><jtitle>Sadhana (Bangalore)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Naik, Ajit Kumar</au><au>Roshan, Rakesh</au><au>Arora, Kanwer Singh</au><au>Shajan, Nikhil</au><au>Mishra, Subash Chandra</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Continuous cooling transformation diagram and mechanical properties in weld coarse-grain heat-affected zone of API X70 steel</atitle><jtitle>Sadhana (Bangalore)</jtitle><stitle>Sādhanā</stitle><date>2021-06-01</date><risdate>2021</risdate><volume>46</volume><issue>2</issue><artnum>88</artnum><issn>0256-2499</issn><eissn>0973-7677</eissn><abstract>In the present work, continuous cooling transformation (CCT) of coarse-grained heat-affected zone (CGHAZ) and simulation of Charpy-sized impact specimens were performed using a Gleeble 3800 thermomechanical simulator. Results obtained from the dilation studies show significant effect of cooling rates on microstructure and low-temperature (–20 °C) Charpy impact toughness. Phase transformation temperatures (
A
r3
and
A
r1
) and impact toughness decreased while hardness and amount of bainite increased with increasing cooling rates. At slow cooling condition (< 5 °Cs
–1
) quasi-polygonal ferrite and pearlite phases were observed in the microstructure. At medium cooling rate (5–25 °Cs
–1
), bainite and quasi-polygonal ferrite were obtained in the microstructure. For still faster cooling rates, microstructure was completely bainitic in nature. The microstructures were confirmed by hardness measurement where the hardness value for lower, medium and high cooling rates were 191–196, 213–214 and 234–253 HV, respectively. Charpy impact toughness increased with decrease in cooling rate due to the presence of softer ferrite phase.</abstract><cop>New Delhi</cop><pub>Springer India</pub><doi>10.1007/s12046-021-01623-2</doi><orcidid>https://orcid.org/0000-0002-6792-3956</orcidid></addata></record> |
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| ispartof | Sadhana (Bangalore), 2021-06, Vol.46 (2), Article 88 |
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| language | eng |
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| source | SpringerNature Journals; Indian Academy of Sciences; EZB-FREE-00999 freely available EZB journals |
| subjects | Bainite Cooling effects Cooling rate Engineering Ferrite Hardness measurement Heat affected zone Heat treating High strength low alloy steels Impact strength Low temperature Mechanical properties Microstructure Pearlite Phase transitions Polygons Temperature Thermal simulation Thermal simulators Toughness Transformation temperature |
| title | Continuous cooling transformation diagram and mechanical properties in weld coarse-grain heat-affected zone of API X70 steel |
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