Investigation of Capturing Technique for Fatigue Crack of Plasma Sprayed Fe-based Coating

doi:10.3969/j.issn.1000-1093.2016.01.017

Acta Armamentarii ›› 2016, Vol. 37 ›› Issue (1): 109-113.doi: 10.3969/j.issn.1000-1093.2016.01.017

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Investigation of Capturing Technique for Fatigue Crack of Plasma Sprayed Fe-based Coating

PIAO Zhong-yu¹， ZHAO meng-meng¹， XU Bin-shi², WANG Hai-dou²， WEN Dong-hui¹

（1.College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310012, Zhejiang, China；2.National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China）

Received:2015-06-08 Revised:2015-06-08 Online:2016-03-23
Contact: PIAO Zhong-yu E-mail:piaozy@zjut.edu.cn

Abstract

Abstract: Fe-based coatings are deposited by plasma spraying technique. The fatigue wear experiments of the coatings are on-line monitored to capture the dynamic information of the cracks by using acoustic emission (AE) technique. The typical signal model is summarized. The micro-damages on the coating surface are characterized by oil whiting test. The micro-damages on the coating surface are analyzed by FIB-SEM, and its failure mechanism is investigated. Results show that the AE signal model during the fatigue wear process is divided into 3 stages, namely run-in period, stable period, and mutation period. Penetrating test technique is introduced to confirm the micro-damages on the coating surface. The reliability of AE monitoring can also be proved. The results show that the fractures in the coating can be accurately captured by AE signals. The micro-defects are considered to be the origins of coating failure based on the results of FIB-SEM analysis.

Key words: surface and interface for material, plasma spraying, Fe-based coating, fatigue wear, acoustic emission, crack capturing

CLC Number:

TH117

PIAO Zhong-yu， ZHAO meng-meng， XU Bin-shi, WANG Hai-dou， WEN Dong-hui. Investigation of Capturing Technique for Fatigue Crack of Plasma Sprayed Fe-based Coating[J]. Acta Armamentarii, 2016, 37(1): 109-113.

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Investigation of Capturing Technique for Fatigue Crack of Plasma Sprayed Fe-based Coating

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