Zur Theorie der Erholung

Kuhlmann, Doris; Masing, Georg; Raffelsieper, Joseph

doi:10.1515/ijmr-1949-400701

Cited by 8 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of these, the earliest are based not on the dislocation density itself, but on the recovery of strain hardening observed in anneals of cold-worked metals 21 . The increase in yield strength induced by cold work Δσ in these experiments was observed to decay from the initial value Δσ 0 during the anneal following a logarithmic trend…”

Section: Static Recovery Lawsmentioning

confidence: 99%

“…Early (and more recent) investigations of static recovery induced strain hardening through cold-work, and then examined the recovery of such hardening following an anneal [16][17][18][19][20] . This gives access to some indication of the magnitude and kinetics of dislocation recovery, with a strong indication that while the process was thermally activated the effective barrier was density dependent 21 . The mechanism which controls static recovery is less clear, with cross-slip, jog dragging, solute dragging, nonconservative climb, and pipe diffusion all considered as possibilities.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism which controls static recovery is less clear, with cross-slip, jog dragging, solute dragging, nonconservative climb, and pipe diffusion all considered as possibilities. Over time, a number of recovery laws analogous to those for dynamic recovery have been proposed, both from experimental observations and theoretical considerations 19,21 . Each theory-based law is formulated on the basis of a different controlling mechanism, some of which match experimentally observed trends, while others do not.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The kinetics of static recovery by dislocation climb

Kohnert

Capolungo

2022

npj Comput Mater

View full text Add to dashboard Cite

The initial microstructure of a wide range of structural materials is conditioned by thermo-mechanical treatments such as hot-working, tempering, or solution annealing. At the elevated temperatures associated with these treatments the dislocation microstructure evolves, usually decreasing in density through a process known as static recovery. Despite its technological relevance, static recovery is not fully characterized from a theoretical standpoint, with even the controlling mechanisms subject to debate. In this study, a climb-enabled discrete dislocation dynamics (DDD) capability is leveraged to explore the kinetics of static recovery in pure Fe when controlled by dislocation climb. Quantitative data from these simulations is used to develop a revised static recovery law, and provides the parameters appropriate for predictive microstructure models in Fe. This law differs from previous analytical derivations invoking climb of dislocations, following the logarithmic trends typical of experimental observations where prior work did not. Direct comparison between the recovery law derived from DDD to experimental recovery data in alpha Fe shows strong agreement across a range of temperatures, and suggests that climb is the controlling mechanism for static recovery in pure metals.

show abstract

Section: Static Recovery Lawsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The kinetics of static recovery by dislocation climb

Kohnert

Capolungo

2022

npj Comput Mater

View full text Add to dashboard Cite

show abstract

“…If f(12R) is simply proportional to (12R), the above equation may be integrated to give ln (1{R)~kt (4) This equation was first suggested by Cherian et al 29 for certain types of recovery in aluminium. Another kinetic law which has been found to fit some recovery data 30,31 is known as the logarithmic or hyperbolic law, expressed as (1{R)~b{a ln t (5) where b and a are both constants, dependent on the recovery temperature.…”

Section: The Back-annealing Processmentioning

confidence: 99%

“…Another kinetic law which has been found to fit some recovery data 30 30,31 is known as the logarithmic or hyperbolic law, expressed as where b and a are both constants, dependent on the recovery temperature.…”

Section: The Back‐annealing Processmentioning

confidence: 99%

‘Back‐annealing’ of cold rolled steels through recovery and/or partial recrystallisation

Ray

Hutchinson

Ghosh

2011

International Materials Reviews

View full text Add to dashboard Cite

An evaluation of the 'back-annealing' approach for the production of high strength steel sheet is presented. This approach is different from those used in conventional current practice, e.g. for rephosphorised, microalloyed, dual phase, multiphase and transformation induced plasticity steels. The principle is to retain as much as possible of the hardening due to cold rolling while gaining ductility by controlled low temperature heat treatment (back-annealing) through recovery and/or partial recrystallisation. Unlike other processes to achieve high strength, this approach offers the possibility of cost effective high speed production in continuous annealing lines. The important role of 'back-annealing' or recovery annealing in the production of ultrafine grains in steels and in the development of higher strength ultra-thin strip cast products has also been widely recognised. In the present review, the fundamentals of the back-annealing process are discussed in terms of the constituent phenomena of recovery and recrystallisation and their kinetics. The challenges of back-annealing in steels, in terms of the production of sheets of thin gauges, are identified and possible methods to overcome these are suggested. Theoretically model approaches to the back-annealing process are also discussed.

show abstract