科研之友
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摘要
Purpose - Super304H steel is a new fine-grained austenitic heat-resistant stainless steel developed in recent years, and it is widely used in high temperature section superheater and reheater tubes of ultra-supercritical thermal power units' boiler. Currently intergranular corrosion (IGC) has occurred in a few austenitic stainless steel tubes in ultra-supercritical units and led to boiler leakage. The purpose of this paper is to find a nondestructive method to quickly and easily detect IGC of austenitic stainless steel tube. @@@ Design/methodology/approach - This paper uses the nonlinear characteristics of ultrasonic propagation in steel tube to detect the IGC of Super304H tube. @@@ Findings - The experimental results show that the nonlinear coefficient generally increases sensitively with the degree of IGC; hence, the nonlinear coefficient can be used to assess IGC degree of tubes, and the nonlinear coefficient measurement method is repeatable for the same tube. @@@ Research limitations/implications - A theory of how IGC would affect the ultrasonic signals and lead to a nonlinear response needs further research. @@@ Practical implications - A nondestructive method to quickly and easily detect IGC is provided. @@@ Social implications - Using ultrasonic nonlinear coefficient to assess IGC degree of tubes is a new try. @@@ Originality/value - This paper provides a new way to test IGC.
- 出版日期2016
- 单位南方电网科学研究院有限责任公司; 北京工业大学
