Study on CTOD and microstructure in flash welded joints for 630-730 MPa grade mooring chains
Three kinds of welding and heat treatment procedures are commonly used to make mooring chains for offshore structure in this paper.In order to determine the toughness,several specimens extracted from the welded joints and base metals are subjected to mechanical testing by means of Crack Tip Opening Displacement (CTOD) tests.Considering the data obtained,it can be recommended that the materials are safe enough in toughness to construct engineering structures (higher than the acceptable value specification by DNV).M2 tempered with 640 (for 60 minutes) presents the highest CTOD and yield ℃ eld strength,followed by M3 tempered with 650℃.M1 tempered with 600℃ presents the lowest CTOD and yield strength.That means tempering at 640℃ can obtain best toughness together with yield strength.The fracture surface and microstructure of the samples are characterized using scanning electron microscopy.Quantitative examinations including grain size analysis and carbide content measurements are carried out.The fracture parameter CTOD is correlated with the fracture surface and microstructures.The carbide contents of M2 and M3 are greater than those of M1 and the greater the carbide content is,the higher the CTOD value will be.And the grain size has the same trend.
Offshore Welded joint Mooring chain CTOD Microstructure
Shuwei Leng Zhangmu Miao Ping Sun Xuelian Yao
School of Transportation of Wuhan University of Technology,Wuhan,430063,P.R.China Foshan Marine Anchor Chain Ltd,Foshan,528132,P.R.China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）