Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy
The hot deformation behavior of nickel-base superalloy UDIMET 720 in solution-treated conditions, simulating the forging process of the alloy, was studied using hot compression experiments. Specimens were deformed in the temperature range of 1000 °C to 1175 °C with strain rates of 10^sup -3^ to 1 s^...
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| Veröffentlicht in: | Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2005-04, Vol.36 (4), p.895-905 |
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| creator | MONAJATI, H JAHAZI, M YUE, S TAHERI, A. K |
| description | The hot deformation behavior of nickel-base superalloy UDIMET 720 in solution-treated conditions, simulating the forging process of the alloy, was studied using hot compression experiments. Specimens were deformed in the temperature range of 1000 °C to 1175 °C with strain rates of 10^sup -3^ to 1 s^sup -1^ and total strain of 0.8. Below 1100 °C, all specimens showed flow localization as shear band through the diagonal direction, with more severity at higher strain rates. A uniform deformation was observed when testing between 1100 °C and 1150 °C with dynamic recrystallization as the major flow softening mechanism above 1125 °C. Deformation above γ' solvus temperature was accompanied with grain boundary separation. The hot working window was determined to be in the interval 1100 °C to 1150 °C. Thermomechanical behavior of the material was modeled using the power-law, the Sellars-Tegart, and an empirical equation. The flow stress values showed a nonlinear dependence of strain rate sensitivity to strain rate. The analysis indicated that the empirical method provides a better constitutive equation for process modeling of this alloy. The apparent activation energy for deformation was calculated and its variations with strain rate and temperature are discussed. [PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1007/s11661-005-0284-z |
| format | Article |
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K</creator><creatorcontrib>MONAJATI, H ; JAHAZI, M ; YUE, S ; TAHERI, A. K</creatorcontrib><description>The hot deformation behavior of nickel-base superalloy UDIMET 720 in solution-treated conditions, simulating the forging process of the alloy, was studied using hot compression experiments. Specimens were deformed in the temperature range of 1000 °C to 1175 °C with strain rates of 10^sup -3^ to 1 s^sup -1^ and total strain of 0.8. Below 1100 °C, all specimens showed flow localization as shear band through the diagonal direction, with more severity at higher strain rates. A uniform deformation was observed when testing between 1100 °C and 1150 °C with dynamic recrystallization as the major flow softening mechanism above 1125 °C. Deformation above γ' solvus temperature was accompanied with grain boundary separation. The hot working window was determined to be in the interval 1100 °C to 1150 °C. Thermomechanical behavior of the material was modeled using the power-law, the Sellars-Tegart, and an empirical equation. The flow stress values showed a nonlinear dependence of strain rate sensitivity to strain rate. The analysis indicated that the empirical method provides a better constitutive equation for process modeling of this alloy. The apparent activation energy for deformation was calculated and its variations with strain rate and temperature are discussed. [PUBLICATION ABSTRACT]</description><identifier>ISSN: 1073-5623</identifier><identifier>EISSN: 1543-1940</identifier><identifier>DOI: 10.1007/s11661-005-0284-z</identifier><identifier>CODEN: MMTAEB</identifier><language>eng</language><publisher>New York, NY: Springer</publisher><subject>Applied sciences ; Constitutive equations ; Constitutive relationships ; Deformation ; Dynamic recrystallization ; Edge dislocations ; Empirical equations ; Exact sciences and technology ; Grain boundaries ; Heat ; Hot pressing ; Hot working ; Metals. Metallurgy ; Nickel alloys ; Nickel base alloys ; Shear bands ; Strain analysis ; Strain rate sensitivity ; Stress analysis ; Superalloys ; Thermomechanical properties ; Yield strength</subject><ispartof>Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2005-04, Vol.36 (4), p.895-905</ispartof><rights>2006 INIST-CNRS</rights><rights>Copyright Minerals, Metals & Materials Society Apr 2005</rights><rights>ASM International & TMS-The Minerals, Metals and Materials Society 2005.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c459t-385493e35286e22f893e5219242d231b41df3bc91d786d356963da838c4c20c43</citedby><cites>FETCH-LOGICAL-c459t-385493e35286e22f893e5219242d231b41df3bc91d786d356963da838c4c20c43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16878365$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>MONAJATI, H</creatorcontrib><creatorcontrib>JAHAZI, M</creatorcontrib><creatorcontrib>YUE, S</creatorcontrib><creatorcontrib>TAHERI, A. K</creatorcontrib><title>Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy</title><title>Metallurgical and materials transactions. A, Physical metallurgy and materials science</title><description>The hot deformation behavior of nickel-base superalloy UDIMET 720 in solution-treated conditions, simulating the forging process of the alloy, was studied using hot compression experiments. Specimens were deformed in the temperature range of 1000 °C to 1175 °C with strain rates of 10^sup -3^ to 1 s^sup -1^ and total strain of 0.8. Below 1100 °C, all specimens showed flow localization as shear band through the diagonal direction, with more severity at higher strain rates. A uniform deformation was observed when testing between 1100 °C and 1150 °C with dynamic recrystallization as the major flow softening mechanism above 1125 °C. Deformation above γ' solvus temperature was accompanied with grain boundary separation. The hot working window was determined to be in the interval 1100 °C to 1150 °C. Thermomechanical behavior of the material was modeled using the power-law, the Sellars-Tegart, and an empirical equation. The flow stress values showed a nonlinear dependence of strain rate sensitivity to strain rate. The analysis indicated that the empirical method provides a better constitutive equation for process modeling of this alloy. The apparent activation energy for deformation was calculated and its variations with strain rate and temperature are discussed. [PUBLICATION ABSTRACT]</description><subject>Applied sciences</subject><subject>Constitutive equations</subject><subject>Constitutive relationships</subject><subject>Deformation</subject><subject>Dynamic recrystallization</subject><subject>Edge dislocations</subject><subject>Empirical equations</subject><subject>Exact sciences and technology</subject><subject>Grain boundaries</subject><subject>Heat</subject><subject>Hot pressing</subject><subject>Hot working</subject><subject>Metals. Metallurgy</subject><subject>Nickel alloys</subject><subject>Nickel base alloys</subject><subject>Shear bands</subject><subject>Strain analysis</subject><subject>Strain rate sensitivity</subject><subject>Stress analysis</subject><subject>Superalloys</subject><subject>Thermomechanical properties</subject><subject>Yield strength</subject><issn>1073-5623</issn><issn>1543-1940</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp90U1LAzEQBuBFFPz8Ad6Cop6imUySzR5F6wdUvLTnkGazurrd1GR7qL_elAqCoKdM4JmZhLcojoFdAmPlVQJQCihjkjKuBf3cKvZACqRQCbada1YilYrjbrGf0htjDCpUe8Xk1jchzu3Qhp64VxutG3xs09C6REJD2hSGV59B161Ili--JtPbx6fRhJSckb51776jM5s8ScuFj9mF1WGx09gu-aPv86CY3o0mNw90_Hz_eHM9pk7IaqCopajQo-Raec4bnS-SQ8UFrznCTEDd4MxVUJda1ShVpbC2GrUTjjMn8KC42MxdxPCx9Gkw8zY533W292GZTCmQaeASsjz_V3ItgSHoDE9_wbewjH3-RTZCCF5JJbM6-VMB5rVY8oxgg1wMKUXfmEVs5zauDDCzDs1sQjM5NLMOzXzmnrPvwTY52zXR9q5NP41KlxrzA74AtRKT_g</recordid><startdate>20050401</startdate><enddate>20050401</enddate><creator>MONAJATI, H</creator><creator>JAHAZI, M</creator><creator>YUE, S</creator><creator>TAHERI, A. 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K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c459t-385493e35286e22f893e5219242d231b41df3bc91d786d356963da838c4c20c43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Applied sciences</topic><topic>Constitutive equations</topic><topic>Constitutive relationships</topic><topic>Deformation</topic><topic>Dynamic recrystallization</topic><topic>Edge dislocations</topic><topic>Empirical equations</topic><topic>Exact sciences and technology</topic><topic>Grain boundaries</topic><topic>Heat</topic><topic>Hot pressing</topic><topic>Hot working</topic><topic>Metals. Metallurgy</topic><topic>Nickel alloys</topic><topic>Nickel base alloys</topic><topic>Shear bands</topic><topic>Strain analysis</topic><topic>Strain rate sensitivity</topic><topic>Stress analysis</topic><topic>Superalloys</topic><topic>Thermomechanical properties</topic><topic>Yield strength</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>MONAJATI, H</creatorcontrib><creatorcontrib>JAHAZI, M</creatorcontrib><creatorcontrib>YUE, S</creatorcontrib><creatorcontrib>TAHERI, A. 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A, Physical metallurgy and materials science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>MONAJATI, H</au><au>JAHAZI, M</au><au>YUE, S</au><au>TAHERI, A. K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy</atitle><jtitle>Metallurgical and materials transactions. A, Physical metallurgy and materials science</jtitle><date>2005-04-01</date><risdate>2005</risdate><volume>36</volume><issue>4</issue><spage>895</spage><epage>905</epage><pages>895-905</pages><issn>1073-5623</issn><eissn>1543-1940</eissn><coden>MMTAEB</coden><abstract>The hot deformation behavior of nickel-base superalloy UDIMET 720 in solution-treated conditions, simulating the forging process of the alloy, was studied using hot compression experiments. Specimens were deformed in the temperature range of 1000 °C to 1175 °C with strain rates of 10^sup -3^ to 1 s^sup -1^ and total strain of 0.8. Below 1100 °C, all specimens showed flow localization as shear band through the diagonal direction, with more severity at higher strain rates. A uniform deformation was observed when testing between 1100 °C and 1150 °C with dynamic recrystallization as the major flow softening mechanism above 1125 °C. Deformation above γ' solvus temperature was accompanied with grain boundary separation. The hot working window was determined to be in the interval 1100 °C to 1150 °C. Thermomechanical behavior of the material was modeled using the power-law, the Sellars-Tegart, and an empirical equation. The flow stress values showed a nonlinear dependence of strain rate sensitivity to strain rate. The analysis indicated that the empirical method provides a better constitutive equation for process modeling of this alloy. The apparent activation energy for deformation was calculated and its variations with strain rate and temperature are discussed. [PUBLICATION ABSTRACT]</abstract><cop>New York, NY</cop><pub>Springer</pub><doi>10.1007/s11661-005-0284-z</doi><tpages>11</tpages></addata></record> |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Applied sciences Constitutive equations Constitutive relationships Deformation Dynamic recrystallization Edge dislocations Empirical equations Exact sciences and technology Grain boundaries Heat Hot pressing Hot working Metals. Metallurgy Nickel alloys Nickel base alloys Shear bands Strain analysis Strain rate sensitivity Stress analysis Superalloys Thermomechanical properties Yield strength |
| title | Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy |
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