Experimental study of the bcc-fcc phase transformations in the Fe-rich system Fe-Si at high pressures

Zhang, J.; Guyot, F.

doi:10.1007/s002690050203

Cited by 38 publications

(12 citation statements)

References 22 publications

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“…At high temperatures, both bcc and hcp phases transform into an fcc structure [39]. For a certain range of pressure and temperature, the bcc structure of iron is found to transform into a reversible fcc structure [40]. Other experimental observations have shown nano grain formation associated with stress-induced phase transformation in steel [41].…”

Section: Discussionmentioning

confidence: 97%

Molecular dynamics simulations of stress-induced phase transformations and grain nucleation at crack tips in Fe

Latapie¹,

Farkas²

2003

Modelling Simul. Mater. Sci. Eng.

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The molecular dynamics simulation technique is used to study a stressinduced new grain formation mechanism at the crack tip of a nanocrystalline α-iron sample at temperatures ranging from 100 to 600 K. The stress-induced formation of new bcc grains, created inside existing grains, is found to occur through a metastable bcc to fcc phase transformation at the crack tip of the sample. A Nishiyama-Wassermann orientation relationship is found between the original bcc grain and the fcc phase and a Kurdjumov-Sachs orientation relationship is found between the new bcc grain created and the fcc transition phase. The new grain nucleation is observed to increase with increasing temperature and stacking faults associated with the fcc phase are observed at the higher temperatures.

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Section: Discussionmentioning

confidence: 97%

Molecular dynamics simulations of stress-induced phase transformations and grain nucleation at crack tips in Fe

Latapie¹,

Farkas²

2003

Modelling Simul. Mater. Sci. Eng.

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“…The XRD pattern was used to characterize the phase transformation (α ferrite-BCC to γ austenite-FCC) that occurred in the welded pipes [23]. Figure 5 represents the XRD patterns of the welded piping specimens obtained from various welding currents (60, 70 and 80 A).…”

Section: Phase Transformation Information Using Xrdmentioning

confidence: 99%

The Electrochemical Investigation of the Corrosion Rates of Welded Pipe ASTM A106 Grade B

Yingsamphancharoen

Srisuwan

Rodchanarowan

2016

Metals

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Abstract:The aim of this work was to investigate the corrosion rate of welded carbon steel pipe (ASTM (American Society for Testing and Materials) A106 Grade B) by GTAW under the currents of 60, 70, and 80 A. All welded pipes satisfied weld procedure specifications and were verified by a procedure qualification record. The property of used materials was in agreement with the ASME standard: section IX. The welded pipe was used for schematic model corrosion measurements applied in 3.5 wt % NaCl at various flow rates and analyzed by using the electrochemical technique with Tafel's equation. The results showed the correlation between the flow rate and the corrosion rate of the pipe; the greater the flow rate, the higher corrosion rate. Moreover, the welded pipe from the welding current of 70 A exhibited higher tensile strength and corrosion resistance than those from currents of 60 and 80 A. It indicated that the welding current of 70 A produced optimum heat for the welding of A106 pipe grade B. In addition, the microstructure of the welded pipe was observed by SEM. The phase transformation and crystallite size were analyzed by XRD and Sherrer's equation. The results suggested that the welding current could change the microstructure and phase of the welded pipe causing change in the corrosion rate.

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“…For example, some pioneering experiments discovered that the iron underwent a stress-induced martensitic phase transformation where the ground state crystal structure of body-centered cubic (bcc) transformed into a hexagonal close-packed (hcp) structure [11]. Within a certain range of pressure and temperature, bcc iron was also found to transform into a reversible face-centered cubic (fcc) structure [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Fcc→bcc→hcp successive phase transformations in the strained ultrathin copper film: A molecular dynamic simulation study

Sun

Ou‐Yang

Ren

et al. 2019

Materials Chemistry and Physics

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The phase transformation behaviors of ultrathin Cu film under uniaxial tensile stress are investigated using molecular dynamic simulation. With the stress increasing, Cu film undergoes a successive phase transformation, i.e. firstly fcc→bcc, then bcc→hcp. The phase transformation process is very fast and thorough, i.e., all parents phase can transit into the new phase almost instantaneously. The crystallography mechanisms of two martensitic transformations are exactly corresponding to Bain and Burgers mechanism, respectively. By examining the formation conditions of such phase transformation in Cu film, we reveal that this fcc→bcc→hcp successive phase transformation will be subject to the very strict simulation conditions, namely stretching along [100] (or [010], [001])direction, definitive tensile speed (1×10 10 /s), appropriate film thickness (0.7230-18.08 nm), low temperature (T≤10K), and continuous stretching process without any relaxation procedure.

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Experimental study of the bcc-fcc phase transformations in the Fe-rich system Fe-Si at high pressures

Cited by 38 publications

References 22 publications

Molecular dynamics simulations of stress-induced phase transformations and grain nucleation at crack tips in Fe

Molecular dynamics simulations of stress-induced phase transformations and grain nucleation at crack tips in Fe

The Electrochemical Investigation of the Corrosion Rates of Welded Pipe ASTM A106 Grade B

Fcc→bcc→hcp successive phase transformations in the strained ultrathin copper film: A molecular dynamic simulation study

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