Research Papers: NDE

Effect of Temperature and Chloride Content on the Stress Corrosion Cracking Susceptibility of 304 Stainless Steel Welded Joints Treated by Ultrasonic Impact Treatment

[+] Author and Article Information
Gang Ma

Taizhou Supervision and
Inspection Center of Special Equipment,
93 Wei Er Road, Taizhou,
Zhejiang 318000, China;
School of Mechanical and Power Engineering,
Nanjing University of Technology,
5 Xin Mo Fan Road, Nanjing,
Jiangsu 210009, China
e-mail: gmnjut@163.com

Xiang Ling

School of Mechanical and Power Engineering,
Nanjing University of Technology,
5 Xin Mo Fan Road, Nanjing,
Jiangsu 210009, China
e-mail: xling@njut.edu.cn

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 18, 2011; final manuscript received December 6, 2011; published online August 26, 2013. Assoc. Editor: Prof. Tribikram Kundu.

J. Pressure Vessel Technol 135(5), 051501 (Aug 26, 2013) (5 pages) Paper No: PVT-11-1014; doi: 10.1115/1.4005871 History: Received January 18, 2011; Revised December 06, 2011

Effect of temperature and chloride content on the stress corrosion cracking (SCC) susceptibility of 304 stainless steel welded joints treated by ultrasonic impact treatment (UIT) is investigated in this study. High tensile weld residual stress is an important factor contributing to SCC. UIT can produce compressive stresses on the surface of welded joints that negate the tensile stresses to enhance the SCC resistance of welded joints. In the SCC testing, the specimens were immersed in sodium chloride solution at the temperatures of 200 °C–280 °C in the range of sodium chloride solution from 50 g/L to 200 g/L. During the testing, treated specimens show good SCC resistance with different temperature and consistency of chloride ion. The results show that the SCC susceptibility of 304 stainless steel welded joints reduces with increase of temperature and decrease of chloride ion consistency. The surface roughness of sample after UIT was investigated by portable surface roughness tester. The results reveal that surface of the samples becomes rougher than the original plate with the increase of the impact duration, which contribute to the pitting corrosion of treated specimens. And, the level of pitting corrosion is reduced with increase of temperature.

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Fig. 1

Schematic diagram of multipass welding/mm

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Fig. 2

Schematic diagram of UIT process/mm

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Fig. 3

Measuring-point location of the specimen/mm

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Fig. 4

Factors contrast curve of SCC susceptibility

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Fig. 5

structure of sample 5-1 after SCC test

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Fig. 6

Pitting corrosion of treated specimens: (a) sample 3-2; (b) sample 3-3; (c) sample 4-2; (d) sample 4-3; (e) sample 5-2; and (f) sample 5-3

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Fig. 7

Surface residual stress of treated plate before and after the SCC test

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Fig. 8

Photograph of the treated surface: (a) sample treated for 60 s; (b) sample treated for120 s



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