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张聪惠,李丰博,王耀勉.热处理对表面纳米化工业纯锆疲劳性能影响研究[J].稀有金属材料与工程(英文),2018,47(10):3233~3237.[ZHANG Conghui,Li Fengbo and WANG Yaomian.Effect of Heat Treatment on Fatigue Properties of Surface Nanocrystallized Commercially Pure Zirconium[J].Rare Metal Materials and Engineering,2018,47(10):3233~3237.]
Effect of Heat Treatment on Fatigue Properties of Surface Nanocrystallized Commercially Pure Zirconium
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Received:January 12, 2017  Revised:October 23, 2018
DOI:
Key words: pure zirconium  fatigue property  heat treatment  residual compressive stress  grain refinement
Foundation item:国家自然科学基金面上项目(项目号51274160),陕西科技统筹创新工程计划项目(项目号2015KTCQ01-80)陕西省基金项目(项目号2016JM5032),表面纳米HCP金属残余应力和织构演化的实验与模拟研究(项目号13JS061)
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ZHANG Conghui,Li Fengbo and WANG Yaomian  
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Abstract:
      Commercially?pure?zirconium?was?strengthened?by?using?the?surface?mechanical?attraction?treatment?(SMAT).?Grains?in?the?surface?have?been?refined?and?compressive?residual?stress?has?been?induced.?Then,?heat?treatment?was?conducted?to?release?the?residual?stress?while?the?refined?microstructure?remained.?surface?microstructures?were?examined?by?optical?microscope?(OM)?and?transmission?electron?microscope?(TEM).?Residual?stresses?at?different?depths?were?measured?by?X-ray?diffraction?method.?Fatigue?properties?were?evaluated?by?four-point?bending?fatigue?test.?Morphology?of?the?fracture?surface?was?observed?by?scanning?electron?microscope?(SEM).?And?influence?mechanism?of?fatigue?properties?was?analyzed.?Based?on?the?experiments,?it?can?be?found?that?the?deformation?layer?with?the?depth?of?150μmwere?formed?after?SMAT.?Average?grain?size?of?surface?was?refined?to?35?nm.?And?a?residual?stress?field?with?depth?of?334?μmand?the?maximum?stress?of?-695.5MPa?can?be?obtained.?After?heat?treatment,?the?depth?of?residual?stress?field?reduced?to?115?μmand?the?maximum?stress?turned?into?-148.8MPa.It?is?found?that?residual?compressive?stress?can?improve?the?fatigue?limit?and?affect?the?location?of?crack?source?significantly.?The?fatigue?limit?of?SMATed?samples?was?increased?by?23%?compared?with?untreated?samples.?After?heat?treatment,?the?fatigue?limit?of?was?increased?by?13%?compared?with?the?samples?before?SMAT.