Papers by Author: Xiang Feng Zheng

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Authors: Xiang Feng Zheng, Nan Wu, Rong Gang Xue, Wen Bin Li, Guo Zhen Dong, Ji Feng Zhao, Er Song Chen, Peng Sun, Qiang Wang
Abstract: Through methods, such as microscope analysis, chemical analysis, hardness analysis, metallography examination etc, the causes resulting in reheater tube cracking of 300MW station boiler have been analyzed. The result indicates this reheater tube cracking is reheat crack. The higher sensitive temperature in operating, excessive welding residual stress are the primarily inducement of cracking. In welding repair, the measures , such as replacing the material ,lower welding heat input, preheat treatment and so on, were taken. The welding repair succeeded greatly.
619
Authors: Xiang Feng Zheng, Nan Wu, Yun Jian Jiang, Wen Bin Li, Xiao Jun Hao, Hao Ke, Wen Peng Li, Xiao Hao Dai
Abstract: Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube bursting of 300MW station boiler have been analyzed. The raw material defects is the primarily inducement of bursting failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer and so on, were taken. The welding repair succeeded greatly.
422
Authors: Xiang Feng Zheng, Er Song Chen, Qing Wang, Ji Feng Zhao, Guo Zhen Dong, Wen Bin Li, Nan Wu, Yan Ting Feng, Qiang Wang
Abstract: Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube bursting of 600MW station boiler have been analyzed. The result indicates this water wall tube burst is the high temperature creep fracture. The higher operating temperature, microstructure aging and high temperature strength degradation are the primarily inducement of bursting failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer, assigning reasonably heat treatment power, lengthening holding time and so on, were taken. The welding repair succeeded greatly.
1339
Authors: Xiang Feng Zheng, Yun Jian Jiang, Rong Gang Xue, Nan Wu, Wen Bin Li, Xiao Jun Hao
Abstract: Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube cracking of the supercritical boiler have been analyzed. The result indicates this water wall tube cracking is the high temperature creep fracture. The higher tensile stress, microstructure aging and high temperature strength degradation are the primarily inducement of cracking failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer, assigning reasonably heat treatment power, lengthening holding time and so on, were taken. The welding repair succeeded greatly.
1410
Authors: Jie Ouyang, Xue Xia Xu, Yan Ting Feng, Xiao Guang Niu, Guang Zong Yan, Xiang Feng Zheng, Hao Ke, Tao Sun
Abstract: The failure analysis was performed for T91 finishing superheater bursting tube. It is concluded that improper initial microstructure resulted from non-standard heat treatment contributes to poor creep properties at high temperature and subsequent tube bursting. In addition, life evaluation was carried out on the basis of creep-rupture test result of experimental steel with similar improper microstructure. It is in accordance with the practical condition and provides significant guidance for safety and operation supervision.
187
Authors: Xiang Feng Zheng, Yan Ting Feng, Xiao Guang Niu, Qing Wang, Xiao Jun Hao, Wen Bin Li, Xue Xia Xu, Peng Sun
Abstract: Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallographic examination, the causes resulting in tee joint crack of subcritical power station boiler final superheater header (12Cr1MoV) have been analyzed. The result indicates the tee joint crack is reheat crack, and irrational structure and excessive welding residual stress are the primary inducement of tube joint crack.
615
Authors: Xiao Jun Hao, Ji Feng Zhao, Xiao Guang Niu, Chang Fu Liu, Wen Bin Li, Xiang Feng Zheng
Abstract: The feasibility of the application of probes with refraction angle of 20 degrees is discussed, and application effects of the probe are verified by experimental testing. The result shows, for ultrasonic TOFD testing of small flaws in lower part of high-wall-thickness work-pieces, the probe pair with refraction angle of 20 degree is superior to 45 degrees.
957
Authors: Qing Wang, Xiang Feng Zheng, Yan Ting Feng, Xiao Guang Niu, Xiao Jun Hao, Wen Bin Li, Ji Feng Zhao, Guo Zhen Dong
Abstract: Through methods, such as microscope analysis, metallography examination, the causes resulting in tee joint crack of subcritical power station boiler platen superheater header have been analyzed. The result indicates the tee joint crack originated in the original defects, expanded to connect with reheat cracking and leaked finally. In repair crack, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer, hammer blowing, assigning reasonably heat treatment power ,lengthening holding time and so on, were taken. The welding repair succeeded greatly.
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