EPMA Test of Nitrogen in Stainless Steel Heat Exchanger Tube with Expansion Crack Failure

ZHAO Tongxin; WANG Yiquan; CUI Huijie; SUN Youbao; HUANG Taohong

doi:10.11973/lhjy-wl202106010

PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2021 > 57(6): 45-47,65. > DOI: 10.11973/lhjy-wl202106010

ZHAO Tongxin, WANG Yiquan, CUI Huijie, SUN Youbao, HUANG Taohong. EPMA Test of Nitrogen in Stainless Steel Heat Exchanger Tube with Expansion Crack Failure[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2021, 57(6): 45-47,65. DOI: 10.11973/lhjy-wl202106010

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EPMA Test of Nitrogen in Stainless Steel Heat Exchanger Tube with Expansion Crack Failure

Analytical Applications Center of SHIMADZU(China) Co., Ltd., Shanghai 200233, China

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Received Date: July 21, 2020

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Abstract

Cracks appeared in the expansion process of a 2205 duplex stainless steel heat exchanger tube. The failure causes of the heat exchanger tube were analyzed by electron probe micro analyzer (EPMA). The results show that the enrichment of local strong austenite forming element nitrogen led to abnormal microstructure distribution here. The single-phase zone of coarse austenite was formed at the position where the content of two-phase should be similar, and its plasticity and strength were worse than the normal microstructure. In the process of machining, microcracks initiated and eventually led to the expansion crack of the heat exchanger tube.
- duplex stainless steel,
- failure analysis,
- electron probe micro analyzer,
- nitrogen element,
- abnormal microstructure

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