Study on COD testing of thick weldment.

Kajimoto, Katsuya; Tani, Mitsuo; Ikutoh, Nobuaki

doi:10.2207/qjjws.4.182

Cited by 2 publications

(2 citation statements)

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“…4. Measurement of welding residual stress through thickness; (a) Kajimoto's way [13] and (b) the method used in this study. precracking resulting in redistribution of the welding residual stress.…”

Section: Making Of Uniform Precrackmentioning

confidence: 99%

“…Like using Chevron notch [12], other methods also tailed to get the satisfactorily uniform precrack. On the other hand, Kajimoto et al [13] proposed another method in which par- tial arc notch and drill hole notch were made at the region under relatively compressive and tensile residual stress respectively, as shown in Fig. 3.…”

Section: Making Of Uniform Precrackmentioning

confidence: 99%

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Evaluation of cryogenic fracture toughness in SMA-welded 9% Ni steels through modified CTOD test

Jang

Yang

Kim

et al. 1997

Metals and Materials

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As the first step of the study for the safety performance of LNG storage tank based on the concept of fitness-fi)r-purpose, the change of cryogenic toughness within the X-grooved weld HAZ (heat-affected zone) of SMA (shielded metal arc)-welded QLT (quenching, lamellarizing, and tempering)-processed 9% Ni steels, was investigated qualitatively and quantitatively. In general, CTOD (crack tip opening displacement) test is widely used to determine the fracture toughness of steel wcldments. But there is no standard or draft for evaluating the toughness of thick weldment with X-groove such as in this case. Therefore, in this study, modified CTOD testing method for fatigue precracking, calculation of CTOD, examination of fractured specimen was proposed and used. And the results of modified test were compared with those of conventional CTOD test and Charpy V-notch impact test. In addition, the relationship between the fracture toughness and microstrueture was analyzed by OM, SEM and XRD. The cryogenic toughness in HAZ decreased as the evaluated region approached lhe fusion line from base metal. The decrease in toughness was apparently caused by the reduction of the retained austenite content and the absence of grain refinement effect in the coarse-grained zone in HAZ. The austenite reduction resulted from the decrease in nucleation sites for c~ 7 reverse transformation due to the increase in fraction of coarse-grained zone within HAZ. More complex thermal cycles in the mixed zone of weld metal and base metal caused the poor stability of retained austenite in the zone by the redistribution of alloying element in retained austenite. Due to this reason, the toughness drop with decreasing test temperature in F.L. (fusion line)-F.L.+3 mm was larger than that in F.L.+5 mm and F.L.+7 ram.

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Section: Making Of Uniform Precrackmentioning

confidence: 99%

Section: Making Of Uniform Precrackmentioning

confidence: 99%