Interpretation of evaluation indices based on solidification cracking behavior by in situ observation in Trans-Varestraint test

2022 ◽  
Author(s):  
Shotaro Yamashita ◽  
Kazuyoshi Saida
Keyword(s):  
Solidification Cracking ◽  
In Situ Observation ◽  
Cracking Behavior ◽  
Varestraint Test ◽  
In Trans

In Situ Observation Method for Quantitative Evaluation of Solidification Phenomena and Solidification Cracks during Welding

2014 ◽  
Vol 782 ◽  
pp. 3-7
Author(s):  
Kenji Shinozaki ◽  
Motomichi Yamamoto ◽  
Kohta Kadoi ◽  
Peng Wen
Keyword(s):  
High Speed ◽  
Video Camera ◽  
Solidification Cracking ◽  
In Situ Observation ◽  
High Speed Video Camera ◽  
Varestraint Test ◽  
Solidification Cracks ◽  
Observation Method ◽  
Solidification Crack

Solidification cracking during welding is very serious problem for practical use. Therefore, there are so many reports concerning solidification cracking. Normally, solidification cracking susceptibility of material is quantitatively evaluated using Trans-Varestraint test. On the other hand, local solidification cracking strain was tried to measure precisely using in-situ observation method, called MISO method about 30 years ago. Recently, digital high-speed video camera develops very fast and its image quality is very high. Therefore, we have started to observe solidification crack using in site observation method. In this paper, the local critical strain of a solidification crack was measured and the high temperature ductility curves of weld metals having different dilution ratios and different grain sizes to evaluate quantitatively the effects of dilution ratio and grain size on solidification cracking susceptibility by using an improved in situ observation method.

Evaluation of Solidification Cracking Susceptibility during Laser Welding by In-situ Observation Method

2011 ◽  
Vol 38 (6) ◽  
pp. 0603005
Author(s):  
温鹏 Wen Peng ◽  
荻崎贤二 Shinozaki Kenji ◽  
山本元道 Yamamoto Motomichi
Keyword(s):  
Laser Welding ◽  
Solidification Cracking ◽  
In Situ Observation ◽  
Observation Method

SEM In Situ Investigation on Fatigue Cracking Behavior of X80 Pipeline Steel with Inclusions

2011 ◽  
Vol 284-286 ◽  
pp. 1096-1100 ◽  
Author(s):  
Ke Tong ◽  
Yan Ping Zeng ◽  
Xin Li Han ◽  
Yao Rong Feng ◽  
Xiao Dong He
Keyword(s):  
Crack Initiation ◽  
Pipeline Steel ◽  
Fatigue Cracking ◽  
Fatigue Loading ◽  
In Situ Observation ◽  
X80 Pipeline Steel ◽  
Cracking Behavior ◽  
The Matrix ◽  
Extension Period

The micro-mechanical behavior of inclusions in X80 pipeline steel under fatigue loading was investigated by means of SEM in situ observation. The influence of sizes and shapes of inclusion on crack initiation and propagation was analyzed. The result shows that for large-size single-particle inclusion, cracks initiate from the interior under the fatigue loading. When a certain circulation cycles are reached, cracks initiate at the matrix near the sharp corner of the inclusion. The cracks extend at the matrix during the stable extension period and unstable extension period following the crack initiation, until fracture occurred. For chain inclusion, cracks first initiate at the interface between inclusion and matrix within the chain area, and the circulation cycles needed for initiation are far less than single inclusion. Cracks steadily extend after the initiation, and then fracture after very short circulation cycles. A chain of inclusion with the shape corners is serious harmful to the fatigue properties.

scholarly journals Effect of Cladding Conditions on Solidification Cracking Behavior during Dissimilar Cladding of Inconel Alloy FM 52 and 308L Stainless Steel to Carbon Steel: Evaluation of Solidification Brittle Temperature Range by Transverse−Varestraint Test

2020 ◽  
Vol 58 (6) ◽  
pp. 403-412
Author(s):  
Yookyung Kim ◽  
Byungrok Moon ◽  
Namhyun Kang ◽  
Eun-Joon Chun
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Arc Welding ◽  
Differential Method ◽  
Solidification Cracking ◽  
Cracking Behavior ◽  
Factors Affecting ◽  
Inconel Alloy ◽  
Temperature Range ◽  
Varestraint Test

In this study, solidification cracking behavior and susceptibility in dissimilar cladding of Inconel alloy FM 52, 308L stainless steel to carbon steel, was investigated by submerged arc welding and transverse−Varestraint testing with gas tungsten arc welding. The effect of cladding conditions on cracking behavior and susceptibility was extensively evaluated, and metallurgical factors affecting susceptibility were clarified. Depending on the cladding sequence (cladding combination A: Inconel 52→308L, cladding combination B: 308L→Inconel 52), opposite types of solidification cracking behavior were observed. Specifically, solidification cracking was observed only for cladding combination A. Using transverse−Varestraint tests, the solidification brittle temperature range (BTR) was determined to be 298 K for cladding combination A and 200 K for cladding combination B. The reason for solidification cracking in cladding combination A could be its higher solidification susceptibility (i.e., a larger BTR (298 K)) compared with cladding combination B (BTR: 200 K). To elucidate differences in solidification cracking susceptibility, a numerical simulation of non−equilibrium solidification segregation for impurity elements (P, S) was performed, based on velocity dependent solidification theories and the finite differential method. Different segregation behaviors were calculated upon the cladding combinations. The severe segregation of P and S during solidification was found to be one of the important metallurgical factors for the large BTR of cladding combination A, compared with cladding combination B.

scholarly journals In-situ Observation of Solidification Cracking of Laser Dissimilar Welded Joints

2009 ◽  
Vol 27 (2) ◽  
pp. 134s-138s ◽  
Author(s):  
Peng Wen ◽  
Kenji Shinozaki ◽  
Motomichi Yamamoto ◽  
Yasutaka Senda ◽  
Tomoko Tamura ◽  
...  
Keyword(s):  
Welded Joints ◽  
Solidification Cracking ◽  
In Situ Observation

scholarly journals Prediction of Solidification Cracking by In-situ Observation and 3D FEM-Analysis

2009 ◽  
Vol 27 (2) ◽  
pp. 139s-143s ◽  
Author(s):  
Peng WEN ◽  
Kenji SHINOZAKI ◽  
Motomichi YAMAMOTO ◽  
Yasutaka SENDA ◽  
Tomoko TAMURA ◽  
...  
Keyword(s):  
Fem Analysis ◽  
Solidification Cracking ◽  
In Situ Observation ◽  
3D Fem
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