Experimental and Numerical Study of Residual Stress in the WC-12Co HVOF Sprayed Coatings

Subject Areas : Chemistry

Mahdi Jalali Azizpour ¹ , Salman Nourouzi ² , Hamidreza Salimijazi ³ , Davood Sajedipour ⁴ , Hasan Mohammadi majd ⁵ , Foad Saadi ⁶

1 - Department of Mechanical Engineering, Ahwaz branch, Islamic Azad University, Ahwaz, Iran
2 - Department of Mechanical Engineering, Babol University of technology, Babol, Iran
3 - Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
4 - Department of Mechanical Engineering, Ahwaz branch, Islamic Azad University, Ahwaz, Iran
5 - Department of Mechanical Engineering, Ahwaz branch, Islamic Azad University, Ahwaz, Iran
6 - Department of Mechanical Engineering, Ahwaz branch, Islamic Azad University, Ahwaz, Iran

Received: 2013-11-06 Accepted : 2013-12-10 Published : 2013-10-01

Keywords: HVOF, Peening stress, FEM, WC-12Co, XRD,

Abstract :

Thermally sprayed coatings are intrinsically associated with residual stresses in the deposits. These stresses are varied in nature and magnitude, and have a pronounced effect on the mechanical behavior of the system. In the current study, WC-12Co coatings were deposited using HVOF thermal spraying. The sin2ψ method was used to evaluate the through thickness residual stress by means of XRD after mechanical layer removal process. A nonlinear explicit-implicit finite element model was developed to study the peening and thermal stress during the high velocity impact of WC-12Co particle and cooling the splat and coating layers. The average of through thickness residual stress using X-Ray diffraction and numerical model was -157.1 MPa and -133.4 MPa respectively. The results showed that the residual stress was compressive and had a good agreement with the experimental results in literature.

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