Intergranular Corrosion of 316LN Stainless Steel Welded Joints

doi:10.11901/1005.3093.2014.455

Chinese Journal of Materials Research

2015, Vol. 29

Issue (4): 299-306 DOI: 10.11901/1005.3093.2014.455

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Intergranular Corrosion of 316LN Stainless Steel Welded Joints

Dongdong WANG^1,^**(

),Can LIANG¹,Wenjie BAI¹,Yongquan LI²,Quan DUAN¹

1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
2. China Special Equipment Inspection and Research Institute, Beijing 100000, China

Cite this article:

Dongdong WANG,Can LIANG,Wenjie BAI,Yongquan LI,Quan DUAN. Intergranular Corrosion of 316LN Stainless Steel Welded Joints. Chinese Journal of Materials Research, 2015, 29(4): 299-306.

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Abstract

The intergranular corrosion characteristics of 316LN austenitic stainless steel welded joints with different welding heat input in boiling nitric acid solution were investigated by metallography analysis and acoustic emission technology. The results show that the resistance to intergranular corrosion of welded joints deteriorated with the increasing welding heat input. The intergranular corrosion resistance of the weld zone is better than that of the heat affected zone and the base material. Five stages for the intergranular corrosion process can be differentiated according to the characteristics of the detected acoustic emission spectrum, such as oxidation, passivation, oxide film crack initiation, oxide film crack propagation and finally fast intergranular corrosion. In other words, in the acoustic emission spectrum, there exist an obvious energy peak by 20 kHz representing the oxidation signal; an obvious energy peak by 40 kHz of a burst-like signal representing the stage of passivation process; energy peaks in a range 80 to 100 kHz of burst-like signal representing the oxide film crack initiation; energy peaks by frequency of 60 kHz representing the stage of crack propagation; and finally a peak by 50 kHz of a burst-like signal with a slightly longer duration representing the stage of fast intergranular corrosion.

Key words: materials failure and protection intergranular corrosion acoustic emission technology 316LN metallography analysis

Received: 25 August 2014

Fund: *Supported by National Science and Technology Major Project No. 2011ZX06004-009.

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	Dongdong WANG
	Can LIANG
	Wenjie BAI
	Yongquan LI
	Quan DUAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.455 OR https://www.cjmr.org/EN/Y2015/V29/I4/299

Fig.1 Corrosion rate of metallographic specimen

Fig.2 Intergranular corrosion microstructure of different metallographic structure at the first to the fourth period (a) base material (b) heat affected zone (c) weld zone

Fig.3 Total count of intergranular corrosion process

Fig.4 Total energy of intergranular corrosion process

Fig.5 Amplitude of AE signals at different stages, (a) oxidation (b) passivation (c) oxide film crack initiation (d) oxide film crack propagation (e) fast intergranular corrosion

Fig.6 Different AE signals after wavelet de-noising and reconstruction, (a) oxidation signal (b) passivation signal (c) crack initiation signal (d) crack propagation signal (e) fast intergranular corrosion signal

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