• CN:11-2187/TH
  • ISSN:0577-6686

›› 2013, Vol. 49 ›› Issue (7): 1-4.

• 论文 •    下一篇

纳米压痕法测量等离子喷涂铁基涂层

王海斗;朱丽娜;徐滨士   

  1. 装甲兵工程学院装备再制造技术国防科技重点实验室;中国地质大学(北京)工程技术学院
  • 发布日期:2013-04-05

Measurement of Residual Stress of Plasma Sprayed Fe-based Coating by Nanoindentation

WANG Haidou;ZHU Lina; XU Binshi   

  1. National Key Lab for Remanufacturing, Academy of Armored Forces Engineering School of Engineering and Technology, China University of Geosciences
  • Published:2013-04-05

摘要: 利用无损的绿色检测技术——纳米压痕法测量等离子喷涂铁基涂层表面的残余应力。通过对比无应力和有应力涂层的载荷-位移曲线,得出涂层表面存在残余拉应力。由于无应力和有应力涂层的压痕周围均有明显的凸起变形,目前广泛使用的Oliver法提取残余应力的特征参量——真实接触面积的公式已不适用。利用之前建立的适用于压痕周围有凸起变形的材料的真实接触面积计算公式得到无应力和有应力涂层的真实接触面积,分析两者之间的差异,最终计算出涂层表面的应力值为188 MPa,与X射线法得到的162 MPa较为符合。

关键词: 残余应力, 纳米压痕, 铁基涂层, 凸起变形

Abstract: The nanoindentation method, which is a non-destructive testing technique, is used to measure the residual stress of plasma sprayed Fe-based coating. Tensile stress is proved to be generated on the coating surface through comparing the load-depth curves of stress-free and stressed coatings. As significant pile-up deformation is observed around the indents of both stress-free and stressed coatings, the commonly used Oliver method is not available to calculate the true contact area, which is the characteristic parameter of residual stress. The early established formula for the calculation of true contact area of pile-up material is used to obtain the true contact areas of stress-free and stressed coatings. Based on the difference of the contact areas, the residual stress with the value of 188 MPa is obtained, which agreed well with that (162 MPa) by XRD method.

Key words: Fe-based coating, Nanoindentation, Pile-up, Residual stress

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