Studies on Cratering in Paint Films. I.

Satoh, Tadaaki; TAKANO, Naoko

doi:10.4011/shikizai1937.45.349

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…7a and b). Indeed, such changes in transformation temperature might explain why in the current study, where a bainitic martensitic steel has been investigated, the stresses in the fusion zone and HAZ are significantly less tensile than the peak stresses, 7 Results of Satoh tests 17,18 on a SA508 steel coupons and b SD3 all-weld-metal coupons cooled under constraint from different peak temperatures; it can be seen that, for coupons heated to 850uC, transformation strains on cooling partly compensate for thermal contraction strains; accumulated stress at room temperature is greater for material heated to 680uC…”

Section: Discussionmentioning

confidence: 70%

“…Satoh tests 17,18 were carried out on SA508 steel coupons, as well as on SD3 all-weld-metal specimens, in order to assist in understanding how localised phase transformations would influence the final state of stress in the single bead on plate weld deposits. In each case, the test coupons were prepared by electric discharge machining to the dimensions shown in Fig.…”

Section: Satoh Testing On Matchstick Sized Couponsmentioning

confidence: 99%

“…Satoh tests, 17,18 in which a testpiece is cooled between fixed grips, can reveal the extent to which phase transformations upon cooling are likely to affect the evolution of residual stress in the presence of constraint. 13 Here, the authors first present the results of Satoh tests on matchstick sized coupons of SA508 grade 3 class 1 steel, as well as results for the filler metal that is used throughout the present study.…”

Section: Introductionmentioning

confidence: 99%

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Measured residual stress distributions for low and high heat input single weld beads deposited on to SA508 steel

Francis¹,

Turski²,

Withers³

2009

Materials Science and Technology

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In steel welds, the development of residual stress is often complicated by the solid state phase transformations that occur upon cooling. Here the authors present bulk residual stress distributions, as measured by neutron diffraction, for the configuration of a single pass gas tungsten arc weld bead deposited on to a 20 mm thick SA508 steel substrate. Two specimens were manufactured, one with a low heat input (1?2 kJ mm 21 ) and another with a high heat input (2?4 kJ mm 21 ). The resulting microstructures and residual stress distributions are discussed in terms of the differing thermal excursions across each weld. In regions that are austenitised during welding, the transformation strain on cooling is shown to compensate in part for thermal contraction strains. Accordingly, phase transformations in SA508 steel led to significant reductions in stress within the weld bead and much of the heat affected zone, while the highest tensile stresses were located immediately outside the heat affected zone boundary in the untransformed region.

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Section: Discussionmentioning

confidence: 70%

Section: Satoh Testing On Matchstick Sized Couponsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measured residual stress distributions for low and high heat input single weld beads deposited on to SA508 steel

Francis¹,

Turski²,

Withers³

2009

Materials Science and Technology

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“…3). 28 Approximate values for all other thermophysical properties such as thermal conductivity, for example, were obtained from the literature 16 that accompanies the Sysweld software, where values are specified for a closely related steel (SA 516 steel).…”

Section: Finite Element Modellingmentioning

confidence: 99%

Prediction of residual stress distributions for single weld beads deposited on to SA508 steel including phase transformation effects

Dai

Francis

Withers

2010

Materials Science and Technology

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The sensitivity of residual stress distributions in bainitic-martensitic steel welds to the transformation strains that arise when austenite decomposes on cooling has been assessed by examining the predictions of three models for a simple bead-on-plate configuration. These cover the following scenarios: case I, no phase transformations; case II, transformations with volume change effects only; case III, transformations with volume change effects and associated Greenwood-Johnson transformation plasticity. Austenite decomposition was predicted by implementing Kirkaldy's reaction rate equations as a subroutine in the finite element code Sysweld, eliminating the need for a continuous cooling transformation diagram. Predicted residual stresses were then compared and rationalised alongside measurements obtained by neutron diffraction and the contour method. It was found that serious errors in predicting the location and magnitude of the peak stresses occurred if transformations were not included, while cases II and III gave similar results generally in agreement with the stress maps. Indeed, the trends in the experimental results were intermediate between cases II and III. Differences between the models and the potential for further improvements are discussed.

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“…the conventional tensile test 1 and more advanced tests using the Gleeble (a registered trademark of Dynamic Systems Inc., Austin, TX, USA) machine offering rapid cooling/heating. 2,3 The Satoh test 4,5 simulates the heat affected zone (HAZ) in welds by measuring the axial force that develops in a clamped test sample undergoing thermal cycles. It is thus a method for retrieving stress versus temperature (s-T) curves and evaluating the effect of phase transformations on the induced stresses.…”

Section: Introductionmentioning

confidence: 99%

Simplified method for establishing constitutive equations and flow stress data for welding stress modelling

Aarbogh¹,

M’Hamdi²,

Mo³

et al. 2008

Science and Technology of Welding and Joining

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A new method, called the representative s-T curve approach, has been proposed by which the temperature and microstructural dependency of the flow stress in welding stress simulation tools can be relatively easily determined. The method is based on the ideal plasticity approach and on considering the evolution of the material properties during the temperature cycle in Satoh testing as representative for that taking place in all material points in the heat affected zone in a real welding operation. The method requires prior knowledge to the relevant Continuous Cooling Transformation (CCT) diagram.

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Studies on Cratering in Paint Films. I.

Cited by 4 publications

References 3 publications

Measured residual stress distributions for low and high heat input single weld beads deposited on to SA508 steel

Measured residual stress distributions for low and high heat input single weld beads deposited on to SA508 steel

Prediction of residual stress distributions for single weld beads deposited on to SA508 steel including phase transformation effects

Simplified method for establishing constitutive equations and flow stress data for welding stress modelling

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