STUDY ON CRACKS IN LASER DIRECT–CLADDED TITANIUM LAYER ON LOW CARBON STEEL

doi:10.3724/SP.J.1037.2011.00591

Acta Metall Sin

2012, Vol. 48

Issue (2): 142-147 DOI: 10.3724/SP.J.1037.2011.00591

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STUDY ON CRACKS IN LASER DIRECT–CLADDED TITANIUM LAYER ON LOW CARBON STEEL

XU Hengdong ¹, ZHAO Haiyan¹,S¨orn Ocylok², Igor Kelbassa²

1.Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2.Fraunhofer Institute of Laser Technology, Aachen, Germany, 52074

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XU Hengdong ZHAO Haiyan S¨orn Ocylok Igor Kelbassa. STUDY ON CRACKS IN LASER DIRECT–CLADDED TITANIUM LAYER ON LOW CARBON STEEL. Acta Metall Sin, 2012, 48(2): 142-147.

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Abstract By adjusting laser power and nozzle speed in laser cladding technology, crack–free titanium layer with even thickness and titanium mass percentage over 99%, was obtained on the substrate of low carbon steel without any intermediate layer when heat input was between 12—20 J/mm. The temperature field and the mechanical strain were simulated. Together with phase diagram and EDS, it was found that an interface zone, consisted of TiFe, (TiFe+β–Ti) eutectic compound and α–Ti, was formed between the titanium layer and the substrate. The interface zone is brittle and cracks occur in it. In titanium layer crack also occur if the mechanical strain exceeds the critical plasticity of metal. By reducing heat input, the mechanical strain decreases, thus a crack–free titanium layer with even thickness can be obtained.

Key words: low carbon steel clading Ti laser cladding crack finite element analysis strain analysis

Received: 20 September 2011

Fund:

Supported by National Natural Science Foundation of China (Nos.50505019, 50935008 and 50975268), New Century Excellent Talents in University (No. NCET–07–0503) and Zhejiang Provincial Scientific Research Project (No.2009C21019)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00591 OR https://www.ams.org.cn/EN/Y2012/V48/I2/142

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