Influence of processing temperature on microstructural and mechanical properties of high-alloyed single-phase steels subjected to severe plastic deformation

Vorhauer, A.; Kleber, Siegfried; Pippan, Reinhard

doi:10.1016/j.msea.2005.08.119

Cited by 34 publications

(20 citation statements)

References 19 publications

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“…A detailed description of the HPT equipment used for processing the materials present in this paper is given in Ref. 6). The disk-shaped specimens with a diameter of 14 mm and a height of approximately 0.8 mm are pressed between two anvils, which can be heated or cooled to allow SPD at temperatures between À196 C and 500 C. Furthermore, the rotation speed of the anvils can be varied over a wide range.…”

Section: Methodsmentioning

confidence: 99%

“…The initial process of fragmentation as well as the most important parameters influencing the grain refinement are well documented in literature. [5][6][7][8][9][10] The grain refinement process is especially influenced by the temperature, alloying, the strain rate and the deformation path. 11) Although these major parameters controlling the grain refinement are well known, there still exists no clear explanation for the question how an increasing strain can lead to a steady state in the microstructure and the hardening of a material.…”

Section: Introductionmentioning

confidence: 99%

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Rate Independent and Rate Dependent Structural Evolution during Severe Plastic Deformation

2010

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High pressure torsion (HPT) deformation enables the grain refinement of bulk materials until a saturation region is reached where no further microstructural refinement can be observed. The influence of deformation temperature, alloying and strain rate on the saturation region was examined by using pure aluminum, an Al-1 mass%Mg alloy and an Al-3 mass%Mg alloy. The deformation temperature was varied between À196 C and 450 C. Both, temperature and alloying exhibit a pronounced influence on the saturation microstructure. The measurements reveal either a rate independent behavior of the structural evolution at low temperatures and a rate dependent behavior of the structural evolution at high temperatures. Two different processes are proposed to be the reason for the saturation at low and high homologous temperatures.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rate Independent and Rate Dependent Structural Evolution during Severe Plastic Deformation

2010

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“…ture and their influence on the mechanical and physical properties are usually of special interest. These studies document a continuous decreasing size of the structural element with increasing strain (see, for example [6,8,9] ). Strains larger than 10 are not very often applied, because the processing becomes very difficult or time consuming.…”

mentioning

confidence: 99%

“…At larger equivalent strains, typically between 10-50, in many materials saturation in the structural refinement is observed. [8,9,11,12] The aim of this paper is to summarize our results concerning the most important parameters, which influence the structural evolution at these very large strains. In the first chapter a very short introduction to the different techniques to achieve such large strains is present.…”

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confidence: 99%

The Limits of Refinement by Severe Plastic Deformation

et al. 2006

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The effect of the different processing parameters on the refinement during severe plastic deformation is evaluated. The attention is focused to very high strains, where saturation in the structural refinement is observed. The single phase metals and alloys show a relatively uniform behaviour, with increasing strain the size of structural elements decreases and reaches saturation between equivalent strains of 5 to 50. The resulting ultra fine or nanostructured granular microstructure contains mainly high angle grain boundaries. Alloying, the temperature, and the strain path are the most important parameters controlling the saturation in the structural refinement. The behavior of the dual and multiphase materials during SPD is more complex, it varies from simple homogenisation of the phase distribution, fragmentation of one phase to disintegration and supersaturation of the phases. Severe plastic deformation of these types of materials offers the potential for the production of new types of materials with a nanocrystalline or a nanocomposite structure for a broad range of industrial applications.

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“…The SPD processing of rods with a diameter of 10 mm and a length of 100 mm was conducted by ECAP through 8 passes via route Bc at a temperature of 400 • C. The intersection angle of channels in the die-set was 120 • (Figure 1). The thermal conditions of ECAP processing were selected in accordance with earlier studies [6,19] that demonstrated the efficiency of SPD processing for microstructure refinement and enhancement of the mechanical properties of the austenitic stainless steel at the given temperature, as well as for the formation of grain-boundary segregations and nanotwins resulting in additional strengthening. The number of passes was selected in such a way as to be sufficiently large to impose such a strain under which the hardness and strength of a UFG billet reach saturation.…”

Section: Methodsmentioning

confidence: 99%

Superior Strength of Austenitic Steel Produced by Combined Processing, including Equal-Channel Angular Pressing and Rolling

Karavaeva

Abramova

Enikeev

et al. 2016

Metals

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Enhancement in the strength of austenitic steels with a small content of carbon can be achieved by a limited number of methods, among which is ultrafine-grained (UFG) structure formation. This method is especially efficient with the use of severe plastic deformation (SPD) processing, which significantly increases the contribution of grain-boundary strengthening, and also involves a combination of the other strengthening factors (work hardening, twins, etc.). In this paper, we demonstrate that the use of SPD processing combined with conventional methods of deformation treatment of metals, such as rolling, may lead to additional strengthening of UFG steel.In the presented paper we analyze the microstructure and mechanical properties of the Cr-Ni stainless austenitic steel after a combined deformation. We report on substantial increases in the strength properties of this steel, resulting from a consecutive application of SPD processing via equal-channel angular pressing and rolling at a temperature of 400 • C. This combined loading yields a strength more than 1.5 times higher than those produced by either of these two techniques used separately.

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Influence of processing temperature on microstructural and mechanical properties of high-alloyed single-phase steels subjected to severe plastic deformation

Cited by 34 publications

References 19 publications

Rate Independent and Rate Dependent Structural Evolution during Severe Plastic Deformation

Rate Independent and Rate Dependent Structural Evolution during Severe Plastic Deformation

The Limits of Refinement by Severe Plastic Deformation

Superior Strength of Austenitic Steel Produced by Combined Processing, including Equal-Channel Angular Pressing and Rolling

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