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Failure analysis of crevice corrosion on 304 stainless steel tube heat exchanger

Journal of Iron and Steel Research(International) 2023年第8期30卷 1490-1498页

作者： Chen Dong Shen Qu Chang-ming Fu Zhe-feng Zhang Failure Analysis Center for Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina

The cause of the premature failure of 304 stainless steel tube heat exchanger was investigated.The unique skeleton structure inside the leakage point reveals that this is a new damage mechanism caused by a δ+γ two-phase structure and crevice corrosion.The three-dimensional structure of the leakage point was demonstrated using X-ray diffraction topography.The results of scanning electron microscope examination show the microstructure of the weld to be columnar and dendritic.It is found by electron probe microscope analysis and transmission electron microscopy that columnar dendrites consisted of γ-dendrite and an amount of δ-ferrite phases at the dendrite trunk.Simulated corrosion test results confirmed that the corrosion medium was the chloride ion.Crevice corrosion of chloride ions occurred at weld defects on the inner wall thus forming a concentration cell.Grains of columnar dendrites were then corroded by chloride ions and δ-ferrite phases on the grain boundaries were retained,which formed the particular skeleton corrosion structure.As a result,it led to leakage when the corrosion of weld occurred from the inner wall to the outer wall.

关键词： Crevice corrosion Weld defect Chloride ions δ-ferrite skeleton structure 304 stainless steel

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Exist-Null Combination Model of Structural Topological Optimization with Stress Constraints

Exist-Null Combination Model of Structural Topological Optim...

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The First China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems

作者： YU Xin SUI Yun Kang and YE Bao Rui (Anshan Institute of Iron and Steel Technology Anshan 114002 China) (Beijing Polytechnic University Beijing 100022 China)

＜正＞An exist-null combined model is proposed for the topological optimization of skeleton structure and continuum structure. The model is applied to the topological optimization with stress constraints. It can get satisfactory computational results with rapid and stable convergence. This work also shows that the presence of independent and continuous topological variable is valuable to the research of structural topology optimization.

关键词： structural topology optimization skeleton structure continuum structure independent and continuous topological variable exist-null combination.

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