Change in Dislocation Characteristics with Cold Working in Ultralow-carbon Martensitic Steel

Akama, Daichi; Tsuchiyama, Toshihiro; Takaki, Setsuo

doi:10.2355/isijinternational.isijint-2016-140

Cited by 73 publications

(37 citation statements)

References 14 publications

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“…However, the common methods for estimating the fraction of screw-and edge-type dislocations by the q-value in the mWH method have to make a key assumption that the elastic constants (c 11 , c 12 and c 44 ) or anisotropy are invariant. [5][6][7][8][9][10][11][12] In the numerically calculated results, q-value was strongly dependent on the value of A i ( = 2c 44 / (c 11 − c 12 )) which is the magnitude of elastic anisotropy and dislocation characters. 12) The present variations of ω and orientation-dependent diffraction Young's modulus should give predominant effect on the changes of q-value and line broadening.…”

Section: Evaluation Of Diffraction Young's Modulus By the Direct Fittmentioning

confidence: 91%

“…Up to now, the modified Williamson-Hall (mWH) or the convolutional multiple whole profile (CMWP) methods are widely applied. [5][6][7][8][9][10][11][12] The essential ideas of such methods are originated from dislocation models, which summarized the effect of strain anisotropy in orientation-dependent dislocation contrast factor. 5,13,14) However, the rigorous assumptions, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…full active slip systems, equal probability of edge and screw dislocations and texture free, would limit their practical applications. [5][6][7][8][9][10][11] Further, the dislocation contrast factor (C h00 ) has to be estimated firstly by adopting the elastic constants which was thought of invariant values as well. 12) The absence of micro-strain in mWH method and strong dependence on the initial parameters for fitting procedure in the CMWP method are also the troubles.…”

Section: Introductionmentioning

confidence: 99%

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Correction of Elastic Anisotropy in Williamson-Hall Plots by Diffraction Young’s Modulus and Direct Fitting Method

2018

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It is known that the micro-strain in cold worked iron can be evaluated by the classical Williamson-Hall method using the three data of diffraction peaks: {110}, {211} and {220}. It is not clarified that the obtained value gives the true micro-strain or not. In addition, the accuracy of analysis is not so high because the diffraction strength from {220} plane is generally very weak. In this paper, three methods, i.e. classical Williamson-Hall method, Diffraction Young's Modulus Correction method and Direct Fitting method, ware attempted to reconfirm the reasonability of the classical Williamson-Hall method and to estimate accurate values of the parameter α and the micro-strain ε in the Williamson-Hall equation. The results obtained are as follows: 1) Elastic anisotropy in the Williamson-Hall plots is corrected using the parameter ω which relates to the values of diffraction Young's modulus. 2) The optimal values of parameter ω can be determined by the Direct Fitting method, which can be used to determine the timely orientation-dependent diffraction Young's modulus (E * hkl) in cold worked specimens. 3) It was confirmed that the classical Williamson-Hall method can generally give reliable values for the parameter α and the microstrain ε. 4) No large difference is found for the values of micro-strain ε from the three methods. 5) There is a clear linearity between the micro-strain ε and yield stress in cold rolled iron specimens.

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Section: Evaluation Of Diffraction Young's Modulus By the Direct Fittmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correction of Elastic Anisotropy in Williamson-Hall Plots by Diffraction Young’s Modulus and Direct Fitting Method

2018

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“…37,42) In martensitic steels, the cold-worked plastic deformation easily makes the stress field by the Cottrell atmosphere and generates the cell structure dislocation because of the characteristics of the body-centered tetragonal lattice structure. 43) In a previous study, Kumnick et al 44,45) reported that the dislocations are trap sites for hydrogen in high purity ¡-iron deformed by cold-rolling. Furthermore, a kinetic model for the transport of hydrogen by dislocations with Cottrell atmospheres was proposed by Tien et al 46) Therefore, it is significant to investigate the relation between hydrogen trapping and dislocation as the reversible-trapping site in hydrogen-induced delayed cracking.…”

Section: 1mentioning

confidence: 99%

Effect of Plastic Deformation on Hydrogen Diffusion Behavior of Martensitic Steel in Hydrogen Absorption Environment

et al. 2019

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This study investigates the effect of plastic deformation on hydrogen permeation behavior of martensitic steel using electrochemical hydrogen permeation methods. The values of hydrogen diffusivity in plastically deformed martensitic steel were investigated from a microstructural aspect. Additionally, thermal desorption spectroscopy was performed to verify the tendency of plastic deformation due to hydrogen trapping. It was observed that as the plastic strain applied on the martensitic steel increased, value of hydrogen diffusion coefficient decreased and hydrogen concentration increased. The decrease in hydrogen diffusion coefficient and an increase in hydrogen trapping in the plastically deformed martensitic steel were attributed to an increase in reversible trapping sites caused by strain-induced dislocations.

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“…In general, qualitative illustrations on removing grinded surface by mechanical or/ and electrolytic polish were given. [3][4][5][6] But less quantitative results were shown. 4) In the present work, main attentions will be firstly paid on the strained layer on XRD analyses in ferritic steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Surface Layer Strained by Mechanical Grinding on X-ray Diffraction Analysis

et al. 2018

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X-ray diffraction is a powerful tool for characterizing the microstructure of steels. However, the strained surface by mechanical grinding could cause some errors in X-ray diffraction analysis. In this work, the strained layer was found to affect peak intensity, peak positions and enlarge the full width at half maximum. A quantitative relation between the depth of damaged layer and particle size of sander papers was established.

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Change in Dislocation Characteristics with Cold Working in Ultralow-carbon Martensitic Steel

Cited by 73 publications

References 14 publications

Correction of Elastic Anisotropy in Williamson-Hall Plots by Diffraction Young’s Modulus and Direct Fitting Method

Correction of Elastic Anisotropy in Williamson-Hall Plots by Diffraction Young’s Modulus and Direct Fitting Method

Effect of Plastic Deformation on Hydrogen Diffusion Behavior of Martensitic Steel in Hydrogen Absorption Environment

Effect of the Surface Layer Strained by Mechanical Grinding on X-ray Diffraction Analysis

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