HYDROGEN PERMEATION PARAMETERS OF X80 STEEL AND WELDING HAZ UNDER HIGH PRESSURE COAL GAS ENVIRONMENT

doi:10.11900/0412.1961.2015.00039

Acta Metall Sin

2015, Vol. 51

Issue (9): 1101-1110 DOI: 10.11900/0412.1961.2015.00039

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HYDROGEN PERMEATION PARAMETERS OF X80 STEEL AND WELDING HAZ UNDER HIGH PRESSURE COAL GAS ENVIRONMENT

Timing ZHANG,Yong WANG,Weimin ZHAO(

),Xiuyan TANG,Tianhai DU,Min YANG

College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao 266580

Cite this article:

Timing ZHANG,Yong WANG,Weimin ZHAO,Xiuyan TANG,Tianhai DU,Min YANG. HYDROGEN PERMEATION PARAMETERS OF X80 STEEL AND WELDING HAZ UNDER HIGH PRESSURE COAL GAS ENVIRONMENT. Acta Metall Sin, 2015, 51(9): 1101-1110.

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Abstract

Hydrogen gas is usually included in coal gas environment, so hydrogen induced permeation would happen to pipeline, especially in welding heat affected zone (HAZ). Hydrogen permeation process in pipeline is the preconditions for the following hydrogen embrittlement failure. With the development of coal gas industry, the basic research to the hydrogen permeation behavior in pipeline under coal gas circumstance is still unfortunately lack and urgently needed to supplement. In this work, X80 pipeline steel was used, and the HAZ samples, including intercritical heat affected zone (ICHAZ), fine grained heat affected zone (FGHAZ) and coarse grained heat affected zone (CGHAZ), were experimentally simulated using a Gleeble 3500 simulator. Next, hydrogen permeation tests were conducted on X80 pipeline steel and HAZs in coal gas environment. Calculated results indicated that the hydrogen diffusion coefficient increased with the rise of peak temperature in HAZs, but it was opposite to other parameters, such as sub-surface hydrogen concentration, hydrogen solubility and hydrogen trap density. The mechanism of the difference in HAZ hydrogen permeation parameters was analyzed combined with OM, EBSD and TEM analysis. It turned out that the content of large-angle grain boundaries, the grain boundary straightness and dislocation density were the main factors, where the large-angle grain boundaries and dislocations could dramatically arrest hydrogen atoms while the straight grain boundaries may act as hydrogen diffusion path. For FGHAZ, the straight grain boundary and low dislocation density compared with matrix played the predominant role in hydrogen diffusion process, and thus the hydrogen diffusion coefficient increased compared with steel substrate. For ICHAZ and CGHAZ, the decrease of large-angle grain boundaries and dislocation density acted as the main factor, especially for CGHAZ, the microstructures was mainly composed of tabular bainite ferrite (BF) with large grain size and straight grain boundaries because of the highest peak temperature, and the content of large-angle grain boundaries decreased obviously. In comparation with other regions, CGHAZ had the highest hydrogen diffusion coefficient and the lowest hydrogen trap density and hydrogen solubility.

Key words: coal gas X80 pipeline steel heat affected zone (HAZ) microstructure hydrogen permeation

Fund: Supported by Fundamental Research Funds for the Central Universities (Nos.14CX05020A and 14CX06120A) and Natural Science Foundation of Shandong Province (No.ZR2013EEL023)

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	Timing ZHANG
	Yong WANG
	Weimin ZHAO
	Xiuyan TANG
	Tianhai DU
	Min YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00039 OR https://www.ams.org.cn/EN/Y2015/V51/I9/1101

Fig.1 Weld thermal cycle curves monitored in the simulated welding process (ICHAZ—intercritical heat affected zone, FGHAZ—fine grained heat affected zone, CGHAZ—coarse grained heat affected zone)

Fig.2 Diagram for high pressure hydrogen permeation device

Fig.3 Microstructures of X80 steel (a), ICHAZ (b), FGHAZ (c) and CGHAZ (d) (AF—acicular ferrite, MF—massive ferrite, GB—granular bainitic, PF—polygonal ferrite, BF—bainitic ferrite)

Fig.4 Hydrogen permeation curves of X80 steel and different sub-regions of heat affected zone (HAZ)

Table 1 Hydrogen permeation parameters of X80 steel and different sub-regions of HAZ

Fig.5 Analysis of the hydrogen permeation current transient of X80 steel (a), ICHAZ (b), FGHAZ (c) and CGHAZ (d) by Fourier method (K—slope of the fitted curve)

Fig.6 Orientation maps of bcc phase in X80 steel (a), ICHAZ (b), FGHAZ (c), CGHAZ (d) and inverse pole figure (IPF) (e)

Fig.7 Misorientation angle distributions of X80 steel and different sub-regions of HAZ

Fig.8 TEM images of X80 steel (a), ICHAZ (b), FGHAZ (c) and CGHAZ (d)

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