Effects of strain rate on the hot deformation behavior and dynamic recrystallization in China low activation martensitic steel

Fang, Yuanyuan; Chen, Xizhang; Madigan, Bruce; Cao, Hongyan; Konovalov, S. V.

doi:10.1016/j.fusengdes.2015.11.036

Cited by 39 publications

(22 citation statements)

References 34 publications

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“…According to the obtained data ( Figures 6-8), the maximum equivalent stresses during the whole time of the current impulse occur in the thermal deformation hearth in the zone of contact of the electrode tape with the surface of the part. is is agreed with the calculated data of the developed finite difference mathematical model [20] and normal contact stresses. e increase in the time of the surfacing current impulse helps to reduce the value of the equivalent stresses.…”

Section: Resultssupporting

confidence: 82%

“…It was established in the work [19] that gravity surfacing is performed with tangential force, which leads to the tangential stress appearance in the contact zone of the joined metals that requires taking this factor into account in modeling the electrocontact surfacing process. In the works [20,21], the effect of strain rate on the grain size of rolled steel was simulated and the effect of an energy pulse on the structure of the coating material was also investigated. However, the technology proposed in the works under consideration involves the modification of the surface layers without coating, which does not quite coincide with the purpose of this study.…”

Section: Introductionmentioning

confidence: 99%

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The Finite Element Modulation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Berezshnaya

Gribkov

Borovik

et al. 2019

Advances in Materials Science and Engineering

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The finite element modulation of forming of coating at electric contact surfacing is provided. This model considers distribution of thermal properties and geometric parameters along the thermal deformation zone during the process of electric contact surfacing by tapes. It is found that the change of the value of the speed asymmetry factor leads to increasing of the friction coefficient in the zone of surfacing which is caused by the increasing of the tangential contact stresses in the zone of contact of the electrode tape with the surface of the part. This leads to the forming of the coating with higher adhesion strength, and thereby the higher quality of the restored part under the lower operating regimes such as current pulse, force of the roller electrode, and duration of the current pulse is achieved. Mentioned above allows to decrease the thermal influence on the structure of the material.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

The Finite Element Modulation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Berezshnaya

Gribkov

Borovik

et al. 2019

Advances in Materials Science and Engineering

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“…DRX phenomena is acknowledged as an important feature to restore the ductility of the materials which are being work hardened during deformation process [9][10][11]. The DRX occurred more preferably at higher deformation temperatures and lower strain rates, which in turns causes the grain refinement of the alloy [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Behavior of AISI 422 Stainless Steel During Hot Deformation Processes

Ahmadabadi

Naderi

Mohandesi

et al. 2018

J. of Materi Eng and Perform

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Dynamic recrystallization (DRX) behavior of AISI 422 martensitic stainless steel has been investigated at deformation temperatures of 950-1150 ºC and strain rates of 0.01-1 s -1 . The critical stress for initiation of DRX was determined based on strain hardening rate dependence to flow stress. The normalized critical stress was estimated as σ c /σ P =0.84. In addition, considering the material constants as a function of strain via a third order polynomial fitting, the effect of strain was investigated using an Arrhenius type constitutive equation. Furthermore, in order to examine the competency of the strain-dependent constitutive equations to predict flow stress curves of AISI 422 martensitic stainless steel, two of these constitutive models (Akbari and Ebrahimi models) were investigated. It was found that Akbari et al. constitutive equation cangive a more precise estimation of flow stress curves for the alloy of this study.

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“…After hot deformation process or during inter pass times, the microstructure of deformed alloy is continuously restored [15,16]. Therefore, it is important to investigate the metadynicamic recrystallization plus the subsequent grain growth of the deformed alloy in order to obtain the most desirable microstructure and best mechanical properties of the final products [17,18].…”

Section: Introductionmentioning

confidence: 99%

Grain growth behaviour of an AISI 422 martensitic stainless steel after hot deformation process

Ahmadabadi

Naderi

Mohandesi

et al. 2018

Canadian Metallurgical Quarterly

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The metadynamic softening behavior and grain size refinement of an AISI 422 martensitic stainless steel in the temperature range of 950-1150 ºC was investigated by double-hit compression tests. The deformed specimens were held at deformation temperature with delay times of 5 to300s after achieving a strain of 0.3. The results indicated that at deformation temperatures lower than 1050 ºC, the final average grain size decreases with increasing time, attaining a minimum value at 15s,. However, grain coarsening was observed at deformation temperatures of 1150 and 1100 ºC. Based on the experimental results, a model was established for estimation of the softening fraction at different deformation parameters. The finer grain size was achieved by prior fine pre-austenite grain and lower secondary deformation temperature. The initial grain size of ASTM 5.5 decreased down toASTM7 to ASTM 8.5 at the deformation temperatures of 1020 ºC and 940 ºC, respectively. More uniform grain distribution was obtained with decreasing initial grain size especially at lower deformation temperatures.

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Effects of strain rate on the hot deformation behavior and dynamic recrystallization in China low activation martensitic steel

Cited by 39 publications

References 34 publications

The Finite Element Modulation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

The Finite Element Modulation of Thermostressed State of Coating Formation at Electric Contact Surfacing of “Shaft” Type Parts

Dynamic Recrystallization Behavior of AISI 422 Stainless Steel During Hot Deformation Processes

Grain growth behaviour of an AISI 422 martensitic stainless steel after hot deformation process

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