Fracture Analysis on Drainage Pipe Socket of Boiler

Xue Xia Xu; Yan Ting Feng; Yong Wang; Xiao Guang Niu; Qing Wang; Jie Ouyang

doi:10.4028/www.scientific.net/AMR.690-693.1771

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Experimental Study on Out-Plane Crack Extension in Rimmed Steel
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Fracture Analysis on Drainage Pipe Socket of Boiler
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Prediction of Fatigue Crack Growth of 2024-T351 by Grey GM(1,1) Model with Rolling Check
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Research on the Effect of Pre-Stress on Bending Stiffness of the Ball Screw Based on ANSYS
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Study on Kinetic Competitions of Crystal Growth
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Fracture Analysis on Drainage Pipe Socket of Boiler

Abstract:

Rupture reason of boiler drainage pipe socket was analyzed by means of chemical composition analysis, macro-observation, metallurgical and SEM microstructure examination. Results showed that the rupture of the drainage pipe socket was a result of creep cracking initiated in intercritical zone of HAZ due to long period operation under high temperature. During creep process, carbides precipitated on fine grain boundaries of intercritical zone and grew up gradually into new coarse carbides as favorite nucleation site for creep void. With the growth, coalesce and connection of creep voids carries on, micro-cracks formed on original austenite boundaries and finally led to fracture of weld joint.