文献类型：期刊文献

英文题名：Failure of a tantalum lined tee induced by hydrogen embrittlement

作者：Wei, Zihan[1];Huang, Liyang[2];Guan, Kaishu[1];Zhong, Jiru[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Chongqing Jiangjin Shipbldg Ind Co Ltd, Chongqing 402260, Peoples R China

年份：2025

卷号：167

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20244217214795);WOS:【SCI-EXPANDED(收录号:WOS:001336639100001)】；

基金：This project is funded by the National Natural Science Foundation of China (52105146, 52130511 and 52205173) and the Natural Science Foundation of Sichuan Province of China (2023NSFSC0912) .

语种：英文

外文关键词：Tantalum liner; Tee pipe; Pitting corrosion; Hydrogen embrittlement

摘要：A lined tee leaked a high temperature mixture of HCI gas and steam from the inner tantalum liner into the external carbon pipe. The main causes of failure have been proposed based on several analysis methods, including macroscopic examination, metallographic inspections, chemical composition analysis, hardness test, scanning electron microscopy analysis and energy dispersive spectrometry test. On the basis of experimental analyses, computational fluid dynamics simulations were employed to explore the flow fields of HCI gas and steam in pipelines. It was found that the failure region of the tantalum liner was coincidence with the mixture zone of two media. The root cause of failure was the formation of liquid hydrochloric acid during the start-up of equipment, causing that hydrogen ions in liquid hydrochloric acid penetrated into tantalum, resulting in hydrogen embrittlement cracks. Meanwhile, pitting corrosion was caused in mixing areas. Adjusting the structure of tee pipe from T-type to Y-type was put forward to prevent equipment failure.