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EFFECTS OF LASER SHOCK PROCESSING ON H2S STRESS CORROSION OF X70 PIPELINE STEEL WELDED JOINT |
KONG Dejun, WU Yongzhong, LONG Dan, ZHOU Zhaozheng |
College of Mechanical Engineering, Changzhou University,Changzhou 213016 |
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Abstract The stress corrosion of X70 pipeline welded joint in H2S medium was tested with slow strain rate testing (SSRT), the effect of H2S on sulfide stress corrosion cracking (SSCC) for X70 pipeline welded joint was investigated, and the effect of laser shock processing on SSCC for X70 pipeline welded joint was analyzed. The experimental results showed that the grain refinement and compressive residual stress are produced in the surface of X70 pipeline steel welded joint by laser shock processing, thus increasing the resistance to stress corrosion for X70 pipeline welded joint in the NACE saturated H2S solutions. The average index of stress corrosion sensitivity for the primitive sample in the saturated NACE H2S solution during SSRT was bigger than 25%, having clear tendency of stress corrosion cracking. The average index of stress corrosion sensitivity for the sample treated laser shock processing in the NACE saturated H2S solution was 19.05%, showing its tendency of stress corrosion is not obvious, as a result, laser shock processing has effectively improved resistance to stress corrosion of X70 pipeline steel welded joint.
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Received: 24 February 2010
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Corresponding Authors:
KONG Dejun
E-mail: kong-dejun@163.com
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