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熱處理對表面納米化工業(yè)純鋯疲勞性能影響研究
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西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院

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TG146.4+

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國家自然科學(xué)基金面上項(xiàng)目(項(xiàng)目號51274160),陜西科技統(tǒng)籌創(chuàng)新工程計(jì)劃項(xiàng)目(項(xiàng)目號2015KTCQ01-80)陜西省基金項(xiàng)目(項(xiàng)目號2016JM5032),表面納米HCP金屬殘余應(yīng)力和織構(gòu)演化的實(shí)驗(yàn)與模擬研究(項(xiàng)目號13JS061)


Effect of Heat Treatment on Fatigue Properties of Surface Nanocrystallized Commercially Pure Zirconium
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School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055

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    摘要:

    采用表面機(jī)械研磨處理(SMAT)對工業(yè)純鋯進(jìn)行表面強(qiáng)化,使材料表面組織細(xì)化并引入殘余壓應(yīng)力,通過熱處理(HT)使表層殘余壓應(yīng)力釋放而納米晶尺寸保持不變。利用光學(xué)顯微鏡(OM)和透射電子顯微鏡(TEM)對試樣表層顯微組織進(jìn)行表征,利用X射線應(yīng)力儀測試距試樣表面不同深度處殘余應(yīng)力,通過四點(diǎn)彎曲疲勞實(shí)驗(yàn)對熱處理前后試樣疲勞性能進(jìn)行測試,利用掃描電子顯微鏡(SEM)對疲勞斷口形貌進(jìn)行觀察,探討晶粒細(xì)化及殘余壓應(yīng)力對疲勞性能的影響。結(jié)果表明：SMAT使工業(yè)純鋯表層形成150μm左右變形層且最表面晶粒細(xì)化至35 nm左右,并得到深度為334 μm最大應(yīng)力為-695.5MPa的殘余壓應(yīng)力層；熱處理后SMAT處理工業(yè)純鋯表層殘余壓應(yīng)力場深度減至115μm、最大壓應(yīng)力降為-148.8MPa,殘余壓應(yīng)力場的變化對裂紋源位置及材料的疲勞極限影響明顯。SMAT處理使工業(yè)純鋯疲勞極限較未處理試樣提升23%；通過熱處理使其表層殘余壓應(yīng)力釋放后,其疲勞極限較未SMAT處理試樣疲勞極限提高13%。

    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.

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張聰惠,李豐博,王耀勉.熱處理對表面納米化工業(yè)純鋯疲勞性能影響研究[J].稀有金屬材料與工程,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.]
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  • 收稿日期:2017-01-12
  • 最后修改日期:2018-10-23
  • 錄用日期:2017-03-15
  • 在線發(fā)布日期: 2018-11-08
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