孙伶俐,何声馨,李延民,张二亮.基于表面形貌的裂纹萌生阶段滑移带表征[J].表面技术,2017,46(9):240-244.
SUN ling-li,HO Hsin-shen,LI Yan-min,ZHANG Er-liang.Surface Roughness Based Characterization of Slip Band for Damage Initiation[J].Surface Technology,2017,46(9):240-244
基于表面形貌的裂纹萌生阶段滑移带表征
Surface Roughness Based Characterization of Slip Band for Damage Initiation
投稿时间:2017-03-17  修订日期:2017-09-20
DOI:10.16490/j.cnki.issn.1001-3660.2017.09.038
中文关键词:  表面形貌  滑移带  塑性变形  裂纹萌生  镍基高温合金
英文关键词:surface roughness  slip bands  plastic deformation  damage initiation  WaspaloyTM superalloy
基金项目:河南省高等学校重点科研项目(15A460030);国家自然科学基金(51650110502)
作者单位
孙伶俐 郑州大学 机械工程学院,郑州 450001 
何声馨 郑州大学 机械工程学院,郑州 450001 
李延民 郑州大学 机械工程学院,郑州 450001 
张二亮 郑州大学 机械工程学院,郑州 450001 
AuthorInstitution
SUN ling-li School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
HO Hsin-shen School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
LI Yan-min School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
ZHANG Er-liang School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China 
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中文摘要:
      目的 研究WaspaloyTM镍基高温合金在裂纹萌生阶段的表面形貌特征,找出最优表面形貌参数用以表征此阶段的滑移带特征。方法 对WaspaloyTM镍基高温合金试样先机械抛光,然后采用标准金相技术分别进行电解抛光和化学蚀刻,得到两种不同的表面状态。对试样进行低周疲劳试验获得疲劳寿命,并采用透射电子显微镜(TEM)和三维表面轮廓仪,观测分析WaspaloyTM镍基高温合金在电解抛光和化学蚀刻处理后的表面形貌以及裂纹萌生阶段的表面形貌和滑移带特征。对测得的表面形貌参数进行方差分析和自助抽样统计计算,找出最优参数。结果 试样在经过电解抛光和化学蚀刻后,三维表面形貌Sa(表面算数平均偏差)分别是0.72 nm和13.3 nm,试样疲劳寿命分别为800和700。两种制备状态下的样品,算术平均高度增量(ΔSa=Sa(N)Sa(N0))的差异非常小,且ΔSa随疲劳加载周期(N)的增加而增加,当N>100后,ΔSa随N增加的速率减小。结论 电解抛光后的表面质量更好,且表面质量越好,疲劳寿命越高。ΔSa与表面制备方法无关,ΔSa越大,表面越粗糙。经方差分析和自助抽样法计算分析,表面最大峰值(Sp)是最优表面形貌参数,该参数可用于区分滑移带内的损伤晶粒和未损伤晶粒。
英文摘要:
      To investigate surface roughness resulting from damage initiation of a Ni-base superalloy, and find out a most relevant roughness parameter that can extract the salient features of slip bands. The specimens of WaspaloyTM nickel based superalloy are mechanically polished, then chemically-etched and electro-polished respectively using standard metallographic techniques to obtain two different surface states. The fatigue life is obtained by performing low-cycle fatigue tests. The surface morphology and topographical features of fatigue-induced slip bands are investigated by the transmission electron microscope (TEM) and 3D surface profiler.The most relevant roughness parameter for describing the fatigue-induced surface damage is searched using the variance analysis integrated with the bootstrap method. The surface roughness Sa(Surface arithmetic mean deviation)of electrolytic polishing and chemical etching the is 0.72 nm and 13.3 nm respectively, and the fatigue life of the sample is 800 and 700 after chemical etching and electrochemical polishing. The difference of the increment of the arithmetic mean height (ΔSa=Sa(N)Sa(N0)) is very small for both surface states, and ΔSa is exhibited to be monotonically increasing with the number of cycles (N), the rate at which ΔSa is increased is found to decrease gradually especially when N>100. The electro-polished surface is found to be smoother compared to the chemically-etched one,which offers a slightly greater fatigue crack initiation life. ΔSa does not depend on the surface preparation method and the surface roughness is increasing with ΔSa. Based on a variance analysis integrated with the bootstrap method, the maximum peak height (Sp) is shown to be the most relevant parameter enabling the discrimination of damaged and undamaged grains in slip bands.
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