Search Results - "Speer, J. G"

Overview of processing, microstructure and mechanical properties of ultrafine grained bcc steels by Song, R., Ponge, D., Raabe, D., Speer, J.G., Matlock, D.K.

“…Ultrafine grained steels with grain sizes below about 1 μm offer the prospect of high strength and high toughness with traditional steel compositions. These…”
Get full text

Carbon partitioning to austenite from martensite or bainite during the quench and partition (Q&P) process: A critical assessment by Clarke, A.J., Speer, J.G., Miller, M.K., Hackenberg, R.E., Edmonds, D.V., Matlock, D.K., Rizzo, F.C., Clarke, K.D., De Moor, E.

“…The goal of the quench and partition (Q&P) process for steel heat treatment is to enrich austenite with carbon during a partitioning treatment after initial…”
Get full text

Effect of Retained Austenite Stabilized via Quench and Partitioning on the Strain Hardening of Martensitic Steels by De Moor, E., Lacroix, S., Clarke, A.J., Penning, J., Speer, J.G.

“…A novel heat-treating process, quench and partitioning (Q&P), has been proposed as a fundamentally new way to produce martensitic microstructures containing…”
Get full text

Rapid Thermal Processing to Enhance Steel Toughness by Judge, V. K., Speer, J. G., Clarke, K. D., Findley, K. O., Clarke, A. J.

“…Quenching and Tempering (Q&T) has been utilized for decades to alter steel mechanical properties, particularly strength and toughness. While tempering…”
Get full text

Influence of interface mobility on the evolution of austenite–martensite grain assemblies during annealing by Santofimia, M.J., Speer, J.G., Clarke, A.J., Zhao, L., Sietsma, J.

“…The quenching and partitioning (Q&P) process is a new heat treatment for the creation of advanced high-strength steels. This treatment consists of an initial…”
Get full text

Hydrogen Effects in Prestrained Transformation Induced Plasticity Steel by Ronevich, J. A., De Cooman, B. C., Speer, J. G., De Moor, E., Matlock, D. K.

“…Thermal desorption analysis (TDA) was performed on laboratory heat-treated transformation induced plasticity ( TRIP) steel with 14.5 pct retained austenite…”
Get full text

Quenched and Partitioned Microstructures Produced via Gleeble Simulations of Hot-Strip Mill Cooling Practices by Thomas, G. A., Speer, J. G., Matlock, D. K.

“…Previous researchers reported on quenched and partitioned (Q&P) microstructures produced via carbon partitioning from martensite into austenite during…”
Get full text

Effects of Short-Time Tempering on Impact Toughness, Strength, and Phase Evolution of 4340 Steel Within the Tempered Martensite Embrittlement Regime by Euser, V. K., Williamson, D. L., Clarke, K. D., Findley, K. O., Speer, J. G., Clarke, A. J.

“…While tempering reactions under furnace conditions have been extensively studied, short-time tempering at higher temperatures, as might apply to induction…”
Get full text

Austenite Stability Effects on Tensile Behavior of Manganese-Enriched-Austenite Transformation-Induced Plasticity Steel by GIBBS, P. J, DE MOOR, E, MERWIN, M. J, CLAUSEN, B, SPEER, J. G, MATLOCK, D. K

Get full text

The Influence of Niobium Microalloying on Austenite Grain Coarsening Behavior of Ti-modified SAE 8620 Steel by Alogab, K. A., Matlock, D. K., Speer, J. G., Kleebe, H. J.

“…The potential for suppressing unacceptable austenite grain growth during carburizing by Nb microalloying additions in the range of 0.02 to 0.11 wt% to a…”
Get full text

Effects of Deformation Behavior and Processing Temperature on the Fatigue Performance of Deep-Rolled Medium Carbon Bar Steels by Richards, M. D., Burnett, M. E., Speer, J. G., Matlock, D. K.

“…The effects of processing temperature on the deep-rolling response of three medium carbon bar steels, a quenched and tempered 4140 alloy, a 0.34C, 1.21Mn,…”
Get full text

Austenite Stability Effects on Tensile Behavior of Manganese-Enriched-Austenite Transformation-Induced Plasticity Steel by Gibbs, P. J., De Moor, E., Merwin, M. J., Clausen, B., Speer, J. G., Matlock, D. K.

“…Manganese enrichment of austenite during prolonged intercritical annealing was used to produce a family of transformation-induced plasticity (TRIP) steels with…”
Get full text

Influence of interface migration during annealing of martensite/austenite mixtures by Speer, J. G., Hackenberg, R. E., Decooman, B. C., Matlock, D. K.

“…Tempering of martensite in the absence of carbide precipitation leads to carbon partitioning into retained austenite. If the martensite/austenite interface is…”
Get full text

The Effects of Heating Rate on Austenite Grain Growth in a Ti-modified SAE 8620 Steel with Controlled Niobium Additions by AlOgab, K. A., Matlock, D. K., Speer, J. G., Kleebe, H. J.

“…The effects of heating rate on austenite grain growth and precipitate distribution in Ti-modified SAE 8620 steels with Nb additions of 0.02, 0.06 and 0.1 wt%…”
Get full text

Characterization of transition carbides in quench and partitioned steel microstructures by Mössbauer spectroscopy and complementary techniques by Pierce, D.T., Coughlin, D.R., Williamson, D.L., Clarke, K.D., Clarke, A.J., Speer, J.G., De Moor, E.

“…Quenching and partitioning (Q&P) produces steel microstructures with martensite and austenite that exhibit promising property combinations for third generation…”
Get full text

Cementite Precipitation in Conventionally and Rapidly Tempered 4340 Steel by Euser, V. K., Williamson, D. L., Clarke, A. J., Speer, J. G.

“…The influence of rapid tempering on cementite precipitation in 4340 steel was investigated within the tempered martensite embrittlement (TME) tempering regime…”
Get full text

Comments on “On the definitions of paraequilibrium and orthoequilibrium” by M. Hillert and J. Ågren, Scripta Materialia, 50, 697–9 (2004) by Speer, J.G., Matlock, D.K., DeCooman, B.C., Schroth, J.G.

“…Some issues raised in the subject paper [Hillert M, Ågren J. Scr Mat 2004;50:697–9. [1]] are addressed, and it is suggested that the term “constrained…”
Get full text

Quenching and partitioning martensite—A novel steel heat treatment by Edmonds, D.V., He, K., Rizzo, F.C., De Cooman, B.C., Matlock, D.K., Speer, J.G.

“…A novel concept for the heat treatment of martensite, different to customary quenching and tempering, is described. This involves quenching to below the…”
Get full text

Quantitative investigation into the influence of temperature on carbide and austenite evolution during partitioning of a quenched and partitioned steel by Pierce, D.T., Coughlin, D.R., Williamson, D.L., Kähkönen, J., Clarke, A.J., Clarke, K.D., Speer, J.G., De Moor, E.

“…The influence of partitioning temperature on microstructural evolution during quenching and partitioning was investigated in a 0.38C1.54Mn1.48Si wt.% steel…”
Get full text

Perspectives on Quenching and Tempering 4340 Steel by Clarke, A. J., Klemm-Toole, J., Clarke, K. D., Coughlin, D. R., Pierce, D. T., Euser, V. K., Poplawsky, J. D., Clausen, B., Brown, D., Almer, J., Gibbs, P. J., Alexander, D. J., Field, R. D., Williamson, D. L., Speer, J. G., Krauss, G.

“…Steels are ubiquitous due to their affordability and the landscape of useful properties that can be generated for engineering applications. But to further…”
Get full text