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Numerical Simulation of Thermal-Mechanical Behavior during Laser Cladding 316L Stainless Steel Powder

Author: LuoMingXian
Tutor: GaoShiYou
School: Yanshan University
Course: Materials Processing Engineering
Keywords: Laser cladding Numerical simulation Temperature field Stress field Substrate deformation Technology parameters Operating module
CLC: TG174.44
Type: Master's thesis
Year: 2011
Downloads: 92
Quote: 1
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Abstract


Laser cladding works that adding the cladding material on the substrate, and making use of the high-energy density laser bean and making the cladding material and the substrate skin layer fused together, then form the integrated with metal added substance cladding on the parent metal. On the process of cladding uneven temperature field and huge temperature gradient will cause heat stress in the substrate distributed unevenly, then lead to deforming of the substrate and cracking of the cladding; it will have a strong impact on the laser cladding quality, and then industrialization process of the laser cladding technique will be subjected to a holdup. This text will set controling the substrate deformation as the goal and research on numerical simulation of the temperature field of the substrate, thermal stress field and displacement field.This text through the unit life and death technique finite element modelling, carring out the movement of the laser bean and the dynamic addition of the cladding powder, then get the change law of the laser cladding model temperature field, and get the temperature field change information under the conditions of different laser powers, different sweep speeds, different overlap rates and different interlamination cooling times. At the same time, under the conditions of different technics, we make the contrasting analysis between the highest temperature in the cladding and the temperature gradient, then get that Y direction is the main direction that heat dissipates.As the temperature filed analysis result is the basis, analyzes the change condition of stress, deformation under the condition of different technological parameters in the process of laser cladding. The analysing result shows that pulling stress value level is the highest in the scanning direction, and it is the highest in the combining site of cladding and Substrate, this is the main reason that causes the cladding crack. At the same time we get that, Plastic deformation on the Substrate focus on around the cladding; outsid this area, the displacement of the Substrate is rigidity displacement. It provides the possibility to determine the crack of the cladding.Through the laser cladding experiment, we survey the change condition of impact point transient state temperature on the Substrate and displacement on the Substrate tip. We inspect and verify numerical value model result and summarize that the characteristic of shape distortion on the Substrate tip.At the end, we develop ANSYS operating system making use of VB, thus meet the practical engineering need better.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal complex layer of protection
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