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,2018,47(10):3233~3237.[ZHANG Conghui,Li Fengbo,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.]
热处理对表面纳米化工业纯锆疲劳性能影响研究
投稿时间:2017-01-12  修订日期:2018-10-23
中文关键词:  工业纯锆  疲劳性能  热处理  残余应力  晶粒细化
基金项目: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)
中文摘要:
      采用表面机械研磨处理(SMAT)对工业纯锆进行表面强化,使材料表面组织细化并引入残余压应力,通过热处理(HT)使表层残余压应力释放而纳米晶尺寸保持不变。利用光学显微镜(OM)和透射电子显微镜(TEM)对试样表层显微组织进行表征,利用X射线应力仪测试距试样表面不同深度处残余应力,通过四点弯曲疲劳实验对热处理前后试样疲劳性能进行测试,利用扫描电子显微镜(SEM)对疲劳断口形貌进行观察,探讨晶粒细化及残余压应力对疲劳性能的影响。结果表明:SMAT使工业纯锆表层形成150μm左右变形层且最表面晶粒细化至35 nm左右,并得到深度为334 μm最大应力为-695.5MPa的残余压应力层;热处理后SMAT处理工业纯锆表层残余压应力场深度减至115μm、最大压应力降为-148.8MPa,残余压应力场的变化对裂纹源位置及材料的疲劳极限影响明显。SMAT处理使工业纯锆疲劳极限较未处理试样提升23%;通过热处理使其表层残余压应力释放后,其疲劳极限较未SMAT处理试样疲劳极限提高13%。
Effect of Heat Treatment on Fatigue Properties of Surface Nanocrystallized Commercially Pure Zirconium
英文关键词:pure zirconium  fatigue property  heat treatment  residual compressive stress  grain refinement
英文摘要:
      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.
作者单位E-mail
张聪惠 西安建筑科技大学冶金工程学院 jiandazhang2010@hotmail.com 
李丰博 西安建筑科技大学冶金工程学院 coollifengbo@foxmail.com 
王耀勉 西安建筑科技大学冶金工程学院  
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