2006, Vol. 42

Issue (5): 454-458 DOI:

Research Articles

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. . Acta Metall Sin, 2006, 42(5): 454-458 .

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Abstract Abstract. RP/M is an advance technology based on build-up and discrete idea, and Laser direct deposition by coaxially feeding the powders to laser melting pool is a RM technology in general use. It is a critical problem found in this technology that the thermal stress result in the cracking and residual stress. The finite element model of the thermal stress is created in the paper by the use of thermal force coupling method According to laser spot diameter and pointwise deposition. The simulating results depositing vertical thin wall sample of 316L stainless steel have exhibited that the tensile stress presents in the position located at interface joining the substrate on depositing layer（named as interface tensile stress zone）and the top of the depositing layer (named as top tensile stress zone), and the position of those tensile stress zones continue to vary along with the movement of laser beam. The experiment observation demonstrates that the cracking during depositing process individually occur on the top of depositing layer (named as top cracking) and edge positions located at interface joining the substrate on depositing layer（named as edge cracking）.The top cracking occurs in the top tensile stress zone, and edge cracking occurs in the edge positions with maximum tensile stress in the interface tensile stress zone. The simulating results give an appropriate explanation for the cracking phenomenon during depositing the vertical thin wall sample, and that the validation of finite element model and the accuracy of the simulating results have been illustrated.

Key words: Laser direct deposition Metallic Vertical thin wall samples Finite Element Simulation Thermal stress

Received: 16 September 2005

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