Fatigue Strength Improvement of Lap Welded Joints by Low Transformation Temperature Welding Wire — Superior Improvement with Strength of Steel

Ohta, Akihiko; Suzuki, Naoyuki; Maeda, Yasuhiro; Maddox, S J

doi:10.1007/bf03266382

Cited by 37 publications

(33 citation statements)

References 1 publication

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“…The stress may therefore favour the formation of certain crystallographic variants of the martensite over others whose deformations do not comply with the applied stress. [5] In recent years, this phenomenon of transformation plasticity has been exploited for one of the most pernicious problems in welding technology, that of the residual stresses [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65]. The aim is to design welding alloys which compensate for the effects of thermal contraction and stress whilst maintaining the overall mechanical performance [66,67].…”

Section: Martensite and Bainite As Plastic Deformationsmentioning

confidence: 99%

“…• C. This has led to welding consumables which not only have been demonstrated to reduce residual stress and distortion, but also to consequently enhance the fatigue life by impressive amounts [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65]. This is an excellent example of how phase transformation theory has contributed to the alloy design for an essentially practical purpose.…”

Section: Martensite and Bainite As Plastic Deformationsmentioning

confidence: 99%

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Phase transformations contributing to the properties of modern steels

Bhadeshia¹

2010

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Section: Martensite and Bainite As Plastic Deformationsmentioning

confidence: 99%

Section: Martensite and Bainite As Plastic Deformationsmentioning

confidence: 99%

Phase transformations contributing to the properties of modern steels

Bhadeshia¹

2010

Bulletin of the Polish Academy of Sciences: Technical Sciences

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“…[7][8][9] There are a number of groups developing welding consumables capable of mitigating the residual stresses that develop when the liquid metal filling a joint solidifies and contracts. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] The mechanism of stress cancellation relies on the solid state transformation of the weld metal into bainite or martensite at a sufficiently low temperature, such that the transformation plasticity cancels any strain due to thermal contraction. It is believed that the extent of this relief is dependent on the selection of crystallographic variants of the transformation product which are thermodynamically favoured in the particular environment of the accumulating residual stress.…”

Section: Introductionmentioning

confidence: 99%

Stainless steel weld metal designed to mitigate residual stresses

Shirzadi

Bhadeshia

Karlsson³

et al. 2009

Science and Technology of Welding and Joining

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There have been considerable efforts to create welding consumables which on solid state phase transformation partly compensate for the stresses which develop when a constrained weld cools to ambient temperatures. All of these efforts have focused on structural steels which are ferritic. In the present work, alloy design methods have been used to create a stainless steel welding consumable which solidifies as d ferrite, transforms almost entirely into austenite which then undergoes martensitic transformation at a low temperature of about 220uC. At the same time, the carbon concentration has been kept to a minimum to avoid phenomena such as sensitisation. The measured mechanical properties, especially toughness, seem to be significantly better than commercially available martensitic stainless steel welding consumables, and it has been demonstrated that the use of the new alloy reduces distortion in the final joint.

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“…Since transition-induced plasticity increases the martensitic transition temperature, the martensitic transition has a significant effect on distribution of residual stress [22]. Ohta [23] studied the effect of solid phase transition on the evolution of residual stress and analysed the influence of diffusion phase transition and non-diffusion phase transition on residual stress. Materials with low phase transition point will result in lower residual stresses; the effect of solid-state phase transition on mechanical properties, solid phase transition volume effect and solid-state phase transition plasticity is the main factors affecting the stress evolution [24].…”

Section: Residual Stress Analysis Of High-strength Steel Pieces Remanmentioning

confidence: 99%

Residual Stress Analysis of Laser Remanufacturing

Dong¹,

Song²,

Xiangyi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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Laser remanufacturing is an advanced repairing method to remanufacture damaged parts based on laser processing, such as laser cladding and laser welding. As a critical factor in determining the remanufacturing quality, residual stress of different laserremanufactured parts was analysed by numerical methods based on deactivating and reactivating element theory, as well as experimental methods such as X-ray diffraction and hole drilling measurements. The distributions and evolution law of residual stress during multipass laser welding of 7A52 high-strength aluminium alloy, and the effects of forming strategy, heat input and solid-state phase transition on residual stress in the laser cladding forming layers of QT 500 cast iron and FV520B high strength steel, were emphatically studied. The simulation results of residual stress fit well with the experimental results, indicating that both residual stress and its accumulation phenomenon would occur during the laser welding and laser cladding forming, and were affected by factors such as welding pass, heat input and phase transition. It is feasible to control residual stress by using cross path forming strategy, less heat input and alloying power materials with low martensite transition point (Ms).

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Fatigue Strength Improvement of Lap Welded Joints by Low Transformation Temperature Welding Wire — Superior Improvement with Strength of Steel

Cited by 37 publications

References 1 publication

Phase transformations contributing to the properties of modern steels

Phase transformations contributing to the properties of modern steels

Stainless steel weld metal designed to mitigate residual stresses

Residual Stress Analysis of Laser Remanufacturing

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