Characterization of microstructural strengthening in the heat-affected zone of a blast-resistant naval steel

Yu, Xinghua; Caron, Jeremy L.; Babu, S. S.; Lippold, John C.; Isheim, Dieter; Seidman, David N.

doi:10.1016/j.actamat.2010.06.031

Cited by 64 publications

(34 citation statements)

References 26 publications

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“…In the HAZ of BA160, the solidstate transformations are complex due to on-heating transformation of martensite to austenite, precipitate growth and coarsening, precipitate dissolution, reformation of precipitates during cooling, and on-cooling transformation of austenite to martensite. A schematic illustration of phase transformation stages [6] in the CGHAZ sample is shown in Figure 7. The Cu solid solubility in austenite and ferrite, evaluated with THERMO-CALC --software using the TCFE5 thermodynamic database, is also shown in Figure 7.…”

Section: A Precipitate Evolution In Heat-affected Zonementioning

confidence: 99%

“…- [6] Two EBSD maps of CGHAZ with high heat input and low heat input are shown in Figure 6. Since dilatation measurements showed no reverse transformation (martensite to austenite) during the second thermal cycle, martensite morphology is assumed similar to that of CGHAZ samples.…”

Section: Martensite Substructurementioning

confidence: 99%

“…[6] Fine martensite substructure contributes to the hardening in the ICHAZ. The current investigation also employed the EBSD technique to study the morphology and crystallography of the martensitic matrix.…”

Section: Martensite Substructurementioning

confidence: 99%

“…Atomprobe tomography (APT) characterization and strengthening analyses correlated the softening to the dissolution of Cu precipitates and carbides. [6] To validate the preceding thermal simulations, gas tungsten arc (GTA) spot welds were made on BA160 samples. [5] Vickers microhardness traverse across spot weld HAZs showed a similar phenomenon as that observed from GLEEBLE samples.…”

Section: To Meet the Rigorous Requirements For The Unitedmentioning

confidence: 99%

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Strength Recovery in a High-Strength Steel During Multiple Weld Thermal Simulations

Caron

Babu

et al. 2011

Metall Mater Trans A

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BlastAlloy 160 (BA160) is a low-carbon martensitic steel strengthened by copper and M 2 C precipitates. Heat-affected zone (HAZ) microstructure evaluation of BA160 exhibited softening in samples subjected to the coarse-grained HAZ thermal simulations of this steel. This softening is partially attributed to dissolution of copper precipitates and metal carbides. After subjecting these coarse-grained HAZs to a second weld thermal cycle below the A c1 temperature (at which austenite begins to form on heating), recovery of strength was observed. Atom-probe tomography and microhardness analyses correlated this strength recovery to re-precipitation of copper precipitates and metal carbides. A continuum model is proposed to rationalize strengthening and softening in the HAZ regions of BlastAlloy 160.

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Section: A Precipitate Evolution In Heat-affected Zonementioning

confidence: 99%

Section: Martensite Substructurementioning

confidence: 99%

Section: Martensite Substructurementioning

confidence: 99%

Section: To Meet the Rigorous Requirements For The Unitedmentioning

confidence: 99%

See 2 more Smart Citations

Strength Recovery in a High-Strength Steel During Multiple Weld Thermal Simulations

Caron

Babu

et al. 2011

Metall Mater Trans A

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“…However, it occurs in fine grained region (FGHAZ) even when the peak temperature is slightly above the Ac 3 . Incomplete austenitizing often occurs in inter critical region (ICHAZ) because the peak temperature is between Ac 3 and the start temperature of ferrite to austenite transformation (Ac 1 ) [20][21][22].…”

Section: Haz Thermal Simulationmentioning

confidence: 99%

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

Zhang

Zhao

Shu

et al. 2017

Metals

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Abstract:The microstructure evolution and the corrosion behavior of welding heat affected zone (HAZ) of Q315NS steel in 50 wt % H 2 SO 4 at 20 • C was investigated with thermal simulation technique, surface analysis and electrochemical tests. The microstructure of ferrite and pearlite was observed in base metal (BM), fine grained region (FGHAZ) and inter critical region (ICHAZ) while coarse grained region (CGHAZ) consisted of granular bainite. The CGHAZ exhibited the highest microhardness and the largest average grain size. The passivation process occurred on the surface of all specimens. Different microstructure give birth to different corrosion behaviors between CGHAZ and BM, FGHAZ, ICHAZ. The dense oxide film were formed on the surface of ferrite while oxide film with micro voids were formed on the surface of pearlite in BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 12 h. The rod-shaped corrosion product was formed on the surface of CGHAZ while the porous-structured corrosion product was formed on the surface of BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 72 h. The corrosion resistance of BM, CGHAZ, FGHAZ and ICHAZ increased during the first 12 h and then declined slowly with increasing immersion time. The BM had the best corrosion resistance while the CGHAZ had the lowest corrosion resistance throughout the corrosion process.

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In Situ Phase Transformation Study in Fine Grained Heat Affected Zone of Grade 91 Steels

Santella

Yamamoto

et al. 2014

In-Situ Studies With Photons, Neutrons and Electrons Scattering II

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Characterization of microstructural strengthening in the heat-affected zone of a blast-resistant naval steel

Cited by 64 publications

References 26 publications

Strength Recovery in a High-Strength Steel During Multiple Weld Thermal Simulations

Strength Recovery in a High-Strength Steel During Multiple Weld Thermal Simulations

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

In Situ Phase Transformation Study in Fine Grained Heat Affected Zone of Grade 91 Steels

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