Study on Susceptibility and Mechanism of Reheat Cracking in Welded Joint of Type 347 Austenitic Stainless Steel

doi:10.1155/2022/2016388

CORC > 兰州理工大学 > 兰州理工大学

	Study on Susceptibility and Mechanism of Reheat Cracking in Welded Joint of Type 347 Austenitic Stainless Steel
	Wang, Jianjun; Yu, Shurong
刊名	INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING
	2022-05-31
卷号	2022
关键词	Austenitic stainless steelCarbidesCracksGrain boundariesLoad testingScanning electron microscopySpectrum analysisStrain rateWelding Characterization techniquesConstant load testsCracking susceptibilityFracture stressGrain-boundariesHighest temperatureReheat crackingSlow strain rate tensile testSteel welded jointsTemperature constant
ISSN号	1687-806X
DOI	10.1155/2022/2016388
英文摘要	The reheat cracking susceptibility of welded joints has been evaluated by 900 degrees C high-temperature constant load test and 750 degrees C-900 degrees C high-temperature slow strain rate tensile (SSRT) test on welded joints of TP347 steel, and the influencing factors and mechanism of reheat cracking in welded joints have been further investigated by microcosmic characterization techniques of SEM and EDS, etc. The result shows the critical fracture stress of TP347 steel welded joints at 900 degrees C is 24 MPa, which is much lower than 80% of the high-temperature yield strength of base material, indicating that the reheat crack of the welded joint is highly sensitive at this temperature; the average reduction of area (RoA) of welded joints obtained by 750 degrees C-900 degrees C SSRT test at each temperature is below 20%, which means all welded joints have a reheat cracking susceptibility in this temperature range, and the reheat cracking susceptibility increases with the rising of temperature. Based on study and analysis using microcosmic methods of optical microscope, scanning electron microscope, and energy spectrum analysis, it is found that welded joints of TP347 steel have a high reheat cracking susceptibility because the high temperature accelerates the diffusion of Cr, Nb, and impurity elements to the grain boundary, and a large quantity of carbides and low-melting-point eutectics are collected and precipitated at the grain boundary to reduce the plasticity of the grain boundary. Since there is a high welding residual stress in welded joints, cavities are formed under the action of the stress at a high temperature, and the merging of cavities causes the formation of cracks which extend along the grain boundary.
WOS研究方向	Engineering
语种	英语
出版者	HINDAWI LTD
WOS记录号	WOS:000810918300001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158845]
专题	兰州理工大学
作者单位	Lanzhou Univ Technol, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Wang, Jianjun,Yu, Shurong. Study on Susceptibility and Mechanism of Reheat Cracking in Welded Joint of Type 347 Austenitic Stainless Steel[J]. INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING,2022,2022.
APA	Wang, Jianjun,&Yu, Shurong.(2022).Study on Susceptibility and Mechanism of Reheat Cracking in Welded Joint of Type 347 Austenitic Stainless Steel.INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING,2022.
MLA	Wang, Jianjun,et al."Study on Susceptibility and Mechanism of Reheat Cracking in Welded Joint of Type 347 Austenitic Stainless Steel".INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING 2022(2022).