Atom-Probe Tomographic Investigation of Austenite Stability and Carbide Precipitation in a TRIP-Assisted 10 Wt Pct Ni Steel and Its Weld Heat-Affected Zones

2018 ◽  
Vol 49 (4) ◽  
pp. 1031-1043 ◽  
Author(s):  
Divya Jain ◽  
David N. Seidman ◽  
Erin J. Barrick ◽  
John N. DuPont
Keyword(s):  
Atom Probe ◽  
Carbide Precipitation ◽  
Austenite Stability ◽  
Weld Heat

Atom probe and STEM studies of carbide precipitation in 2Cr1Mo steel

1993 ◽  
Vol 67 (1-4) ◽  
pp. 334-341 ◽  
Author(s):  
R.C. Thomson ◽  
H.K.D.H. Bhadeshia
Keyword(s):  
Atom Probe ◽  
Carbide Precipitation

scholarly journals An Atom Probe Study of Kappa Carbide Precipitation and the Effect of Silicon Addition

2014 ◽  
Vol 45 (5) ◽  
pp. 2421-2435 ◽  
Author(s):  
Laura N. Bartlett ◽  
David C. Van Aken ◽  
Julia Medvedeva ◽  
Dieter Isheim ◽  
Nadezhda I. Medvedeva ◽  
...  
Keyword(s):  
Atom Probe ◽  
Carbide Precipitation ◽  
Silicon Addition ◽  
Kappa Carbide

Microstructural Features of 'Quenching and Partitioning': A New Martensitic Steel Heat Treatment

2007 ◽  
Vol 539-543 ◽  
pp. 4819-4825 ◽  
Author(s):  
D.V. Edmonds ◽  
K. He ◽  
Michael K. Miller ◽  
F.C. Rizzo ◽  
A. Clarke ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Sheet Steel ◽  
Atom Probe ◽  
Carbide Precipitation ◽  
Martensite Phase ◽  
Quenching And Partitioning ◽  
Transmission Electron ◽  
Quench Temperature ◽  
Untransformed Austenite ◽  
Quenching And Tempering

The microstructure following a new martensite heat treatment has been examined, principally by high-resolution microanalytical transmission electron microscopy and by atom probe tomography. The new process involves quenching to a temperature between the martensite-start (Ms) and martensite-finish (Mf) temperatures, followed by ageing either at or above, the initial quench temperature, whereupon carbon can partition from the supersaturated martensite phase to the untransformed austenite phase. Thus the treatment has been termed ‘Quenching and Partitioning’ (Q&P). The carbon must be protected from competing reactions, primarily carbide precipitation, during the first quench and partitioning steps, thus enabling the untransformed austenite to be enriched in carbon and largely stabilised against further decomposition to martensite upon final quenching to room temperature. This microstructural objective is almost directly opposed to conventional quenching and tempering of martensite, which seeks to eliminate retained austenite and where carbon supersaturation is relieved by carbide precipitation. This study focuses upon a steel composition representative of a TRIP-assisted sheet steel. The Q&P microstructure is characterised, paying particular attention to the prospect for controlling or suppressing carbide precipitation by alloying, through examination of the carbide precipitation that occurs.

Effect of Post-Weld Heat Treatment on Carbide Precipitation and Impact Properties of Coarse-Grained Heat-Affected Zone of Q690 Steel

2014 ◽  
Vol 989-994 ◽  
pp. 576-580 ◽  
Author(s):  
Zhen Shun Li ◽  
Sheng Li Li ◽  
Lei Tian ◽  
Xiang Hai Zhang ◽  
Ji Zhi Liu
Keyword(s):  
Heat Treatment ◽  
Grain Boundaries ◽  
Heat Affected Zone ◽  
Unit Area ◽  
Carbide Precipitation ◽  
Post Weld Heat Treatment ◽  
Coarse Grained ◽  
Impact Properties ◽  
Carbide Particles ◽  
Weld Heat

The effect of post-weld heat treatment (PWHT) on carbide precipitation and impact properties of coarse-grained heat-affected zone (CGHAZ) of Q690 Steel was studied in this paper. Carbide particles precipitated primarily at prior austenite grain boundaries and martensitic lath boundaries. When the PWHT temperature is 520–570 °C, temper embrittlement occurs. This temperature range is also where the number of carbide particles per unit area at grain boundaries reaches its maximum. The high number of particles per unit area increases the rate of crack initiation at grain boundaries under rapid loading; linking of microcracks along grain boundaries which are already weakened by impurity segregation results in TE and intergranular fracture.

scholarly journals Carbide Precipitation in a Low Alloyed Steel during Aging Studied by Atom Probe Tomography and Thermodynamic Modeling

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2009
Author(s):  
Mattias Thuvander ◽  
Hans Magnusson ◽  
Ulrika Borggren
Keyword(s):  
Atom Probe Tomography ◽  
Precipitation Hardening ◽  
Atom Probe ◽  
Carbide Precipitation ◽  
Martensitic Structure ◽  
Number Density ◽  
High Number Density ◽  
Molybdenum Carbides ◽  
The Matrix ◽  
Low Alloyed Steel

Carbide precipitation in martensitic low alloyed steels contributes to the mechanical properties through precipitation hardening. A high number density of carbides is desired to maximize the hardening effect, which is achieved through the precipitation of carbides on the dislocations in the martensitic structure. In this study, the nucleation, growth, and coarsening of vanadium and molybdenum carbides during aging at 600 °C for periods up to four weeks were investigated. The work covers characterization with atom probe tomography, which showed that the nucleation of V and Mo rich MC/M2C carbides takes place on dislocations. The growth of these carbides proceeds by the diffusion of elements to the dislocations, which has been modeled using Dictra software, confirming the rate of the reaction as well as the depletion of carbide formers in the matrix. For longer aging times, particle coarsening will decrease the number density of particles with a transition from dislocation-based carbides to separate rounded carbides.

AISI TYPE 201 MODIFIED

Alloy Digest ◽  
1986 ◽  
Vol 35 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Heat Treating ◽  
Carbide Precipitation ◽  
Regular Type ◽  
Austenite Stability ◽  
Temperature Performance ◽  
Aisi Type ◽  
Low Temperature Toughness ◽  
Nickel Manganese

Abstract AISI TYPE 201 MODIFIED is a chromium-nickel-manganese austenitic stainless steel whose composition is closely controlled to provide sufficient austenite stability for service at temperatures as low as 425 F (245 C). In the interest of minimizing sensitization (carbide precipitation) during welding which can result in a loss of low-temperature toughness, carbon in TYPE 201 MODIFIED is specified at 0.03% max. In regular Type 201, a maximum of 0.15% carbon is allowed. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-476. Producer or source: Allegheny Ludlum Corporation.

scholarly journals Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography

JOM ◽  
2018 ◽  
Vol 70 (9) ◽  
pp. 1752-1757 ◽  
Author(s):  
Arun Devaraj ◽  
Zeren Xu ◽  
Fadi Abu-Farha ◽  
Xin Sun ◽  
Louis G. Hector
Keyword(s):  
Atom Probe Tomography ◽  
Trip Steel ◽  
Atom Probe ◽  
Carbide Precipitation ◽  
Solute Partitioning
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