A new combined SPD technique to improve mechanical properties and electrical conductivity of long-sized billets

Bobruk, Elena V.; Botkin, A. V.; Murashkin, M. Yu.; Рааб, Г. И.

doi:10.1088/1757-899x/1014/1/012004

Cited by 1 publication

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Te reasons for the increased attention to such processes for obtaining materials with a UFG structure are a signifcant increase in process productivity and the possibility of expanding the range of processed materials. Tis is an important aspect of the industrial production of parts with high mechanical characteristics [14,15]. A number of studies point out an additional increase in the strength of parts made of alloys in the UFG state after subsequent plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Structure and Mechanical Properties of Titanium Processed by Twist Extrusion and Subsequent Rolling

Tarasov

Gribkov

Павленко

et al. 2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The article considers one of the combined methods of severe plastic deformation (SPD), which includes twist extrusion (TE) and subsequent rolling. The use of combined forming methods is promising for industrial use. Titanium grade 1 was used as a material in the experiments. Rolling was carried out in three stages with a decrease in temperature from 350°C to 180°C for a number of passes with one heating. The accumulated strain degree was e = 4.6 at twist extrusion and e = 3 in rolling. Increasing the reduction per pass decreases the number of heatings and increases the efficiency of the rolling process in whole. At the same time, it is necessary to set the maximum processing modes at which recrystallization processes do not occur in the billet. When rolling, the deformation degree in one pass was taken in the range of 5–20% with an increase in successive passes. The use of such deformation degrees allowed reducing the grain size in titanium grade 1 significantly. Twist extrusion reduces the grain size to 300–500 nm. Subsequent rolling allowed reducing the size of structural elements to 50–100 nm and provided a significant increase in the mechanical characteristics of the billet material (up to 869 MPa) while maintaining satisfactory ductility (up to 11.6%). It was found that increasing the deformation degree in one pass up to 40% at cross-rolling and simultaneously increasing the temperature to 385°C led to a decrease in the UFG structure quality and reduced strength of the deformable material by starting the dynamic recrystallization process.

show abstract

Section: Introductionmentioning

confidence: 99%