Prior austenite grain size and tempering effects on the dislocation density of low-C Nb–Ti microalloyed lath martensite

Kennett, Shane C.; Krauß, G.; Findley, Kip O.

doi:10.1016/j.scriptamat.2015.05.036

Cited by 84 publications

(29 citation statements)

References 10 publications

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“…In all cases, linear relations can be drawn in which dislocation density increases as the grain size is reduced. Similar trends were observed by Kennett [13] in low-C microalloyed lath martensite steel when the dislocation density were compared with the PAGS.…”

Section: Effect Of Grain Substructures On Dislocation Densitysupporting

confidence: 83%

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Effect of Prior Austenite Grain Size Refinement by Thermal Cycling on the Microstructural Features of As-Quenched Lath Martensite

Hidalgo

Santofimia

2016

Metall Mater Trans A

187

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Current trends in steels are focusing on refined martensitic microstructures to obtain high strength and toughness. An interesting manner to reduce the size of martensitic substructure is by reducing the size of the prior austenite grain (PAG). This work analyzes the effect of PAGS refinement by thermal cycling on different microstructural features of as-quenched lath martensite in a 0.3C-1.6Si-3.5Mn (wt pct) steel. The application of thermal cycling is found to lead to a refinement of the martensitic microstructures and to an increase of the density of high misorientation angle boundaries after quenching; these are commonly discussed to be key structural parameters affecting strength. Moreover, results show that as the PAGS is reduced, the volume fraction of retained austenite increases, carbides are refined and the concentration of carbon in solid solution as well as the dislocation density in martensite increase. All these microstructural modifications are related with the manner in which martensite forms from different prior austenite conditions, influenced by the PAGS.

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Section: Effect Of Grain Substructures On Dislocation Densitysupporting

confidence: 83%

“…Kennett et al [13] observed that as PAGS decreases, the dislocation density of martensite increases, as well as its measured micro-hardness.…”

Section: Introductionmentioning

confidence: 97%

Effect of Prior Austenite Grain Size Refinement by Thermal Cycling on the Microstructural Features of As-Quenched Lath Martensite

Hidalgo

Santofimia

2016

Metall Mater Trans A

187

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“…It suggests that localized plastic deformation increases dislocation densities to a great extent to produce recovery islets. Evidence of dislocations in martensitic steel has been reported earlier [34,35]. Analogous to dislocation cells the independent recovery islets are also constituted by tight packed dislocation walls and recovered cell interiors.…”

Section: Dislocation Cell Structure and Recovery Isletssupporting

confidence: 62%

Microstructural developments during erosion of tribological steels

Mukhopadhyay

Srinivas

Roy

2016

Materials Characterization

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“…sulfide stress corrosion. The Co-base alloy coating deposited by laser cladding It is well known in the literature that the hardness of the martensite increases with decreasing austenite grain size [25][26][27]. The Ac 3 of this steel is 830°C and Ac 1 is 750°C measured using dilatometry.…”

Section: Resultsmentioning

confidence: 99%

Laser Cladding and Thermal Spray Coatings on Steel Pipe Serving the Oil and Gas Industry

Nc¹,

Lc²,

Gl³

et al. 2016

J Material Sci Eng

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Different coating systems were characterized using a commercial API 5CT steel grade L80 type 1, which is commonly used in the oil and gas industry. Two Ni-based alloys and one Co-based alloy were deposited by laser cladding. Two coatings were deposited (Ni-based alloy and a composite W-C/Co-base) by means of thermal spray process. It has been shown the presence of a hard heat affected zone (HAZ) in the substrate for the as-laser deposited coating. The main explanation for this HAZ is devoted to the heat gradient causing a gradient on the prior austenite grain size and consequently different martensite hardness along the HAZ. For the thermal sprayed coatings, no HAZ was formed due to low heat input process. All the studied coating systems seem to be very interesting for different technically demanding applications, such as, stress sulfide corrosion and wear resistance.

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Prior austenite grain size and tempering effects on the dislocation density of low-C Nb–Ti microalloyed lath martensite

Cited by 84 publications

References 10 publications

Effect of Prior Austenite Grain Size Refinement by Thermal Cycling on the Microstructural Features of As-Quenched Lath Martensite

Effect of Prior Austenite Grain Size Refinement by Thermal Cycling on the Microstructural Features of As-Quenched Lath Martensite

Microstructural developments during erosion of tribological steels

Laser Cladding and Thermal Spray Coatings on Steel Pipe Serving the Oil and Gas Industry

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