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Product Code: ICA13_1706

Experimental Analysis of Total Indicated Runout and Residual Stress of Laser Cladding Layer on"A Large-Scale Rotary Component"
Authors:
Jianhua Yao, Research Center of Laser Processing Technology and Engineering, Zhejiang University of Technology; Hangzhou
Qunli Zhang, Research Center of Laser Processing Technology and Engineering, Zhejiang University of Technology; Hangzhou Peoples Republic of China
Shirui Guo, Research Center of Laser Processing Technology and Engineering, Zhejiang University of Technology; Hangzhou Peoples Republic of China
Haiming Lai, Hangzhou Steam Turbine Co.,Ltd; Hangzhou
Jianqiang Kong, Hangzhou Steam Turbine Co.,Ltd; Hangzhou
Presented at ICALEO 2013

During large area laser cladding on the surface of large-scale rotary component, the uniformity of microstructures and properties of the cladding layer is more significant to the service life of the rotary component, even the entire unit. Taking a typical rotary component as example, the multi-track laser cladding experiments with different kinds of alloy powder were performed on 28CrMoNiV rotor shaft substrate by a high power diode laser with coaxial powder feeder. The values of electronic runout of different laser cladding layers were measured and analyzed by a rotor mechanical electronic runout measuring device. The results show that pores and other defects of different cladding layer have great effect on the electronic runout value. Under the same laser process parameters, the hardened layer cladded with 2Cr13 powder can get the minimum electronic runout value. The residual stress and microhardness of 2Cr13 cladding layer were examined by the X-ray stress instrument and microhardness tester. The results show that the microstructure of 2Cr13 cladding layer is homogeneous and compact. The metallurgical bonding between the cladding layer and substrate was achieved without holes and cracks. The surface residual stress of the cladding layer is tensile stress, the value of which gradually decreases from surface to inner. From the cladding layer to heat-affected zone along the coating depth, tensile residual stress changes into compressive residual stress. The highest microhardness of cladding layer is about Hv550, and the average microhardness is Hv500, which is 2 times related that of the substrate.

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