Influence of High Pressure Sliding and Rotary Swaging on Creep Behavior of P92 Steel at 500 °C

Král, Pétr; Dvořák, Jiří; Sklenička, V.; Horita, Zenji; Takizawa, Yukio; Tang, Yongpeng; Kunčická, Lenka; Kvapilová, Marie; Ohanková, Marie

doi:10.3390/met11122044

Cited by 6 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to achieve the UFG microstructure in metallic materials, it is necessary to insert an equivalent strain at least ε eq > 4 at room temperature. However, UFG alloys very often exhibit a lower creep lifetime than their unprocessed materials [14,24,25]. But, opposite results were found in the creep behavior of pure metals.…”

Section: Discussionmentioning

confidence: 97%

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Král,

Dvořák,

Kvapilová

et al. 2024

Crystals

Self Cite

View full text Add to dashboard Cite

This work investigates the creep behavior of severely deformed commercial aluminum. The commercial aluminum was processed by helical rolling (HR) and equal-channel angular pressing (ECAP) at room temperature. During these processes, the equivalent strain up to about 4 was imposed into the as-received material. The creep testing at 200 °C revealed that HR and ECAP significantly increased the time to fracture compared to the as-received material. The stress dependences showed that the value of stress exponent n decreased with the value of the imposed strain. The stress-change tests showed that as-received and severely deformed states exhibited different recovery rates after unloading. The microstructure analysis showed that creep behavior was influenced by the microstructure formed during severe plastic deformation. The relationships between creep behavior and microstructure in the investigated states are discussed.

show abstract

Section: Discussionmentioning

confidence: 97%

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Král,

Dvořák,

Kvapilová

et al. 2024

Crystals

Self Cite

View full text Add to dashboard Cite

show abstract

“…For this reason, the occurrence of a short primary stage is associated with thermal heating during or after the application of the SPD. It is generally accepted that the short primary stage is related to a low density of free dislocations [ 34 , 35 ]. Thus, the creep results suggest that the CT state exhibits a higher density of free dislocations in comparison with the RT state.…”

Section: Discussionmentioning

confidence: 99%

Influence of Cryo-Processing and Post-SPD Annealing on Creep Behavior of CP Titanium

et al. 2022

Self Cite

View full text Add to dashboard Cite

The commercial purity of VT1-0 titanium was processed by the rolling process and executed at elevated, room, and cryo-temperatures. These processings led to the formation of an ultrafine-grained microstructure, with the mean grain size at a nanometer level. Some of these materials were statically annealed at a temperature of 823 K for 1 h, which led to significant subgrains and grain coarsening. The constant load creep tests in tension were carried out in argon on all states of materials, at temperatures of 648–723 K and different ranges of applied stresses. From the value of the steady-state creep rate, the control creep mechanisms were determined. The microstructure analyses were carried out via SEM and TEM. It was found that titanium prepared at elevated and room temperatures have a higher creep strength than titanium prepared at cryo-temperatures. Furthermore, the post-SPD —annealing led to a significant decrease in the creep properties. The influence of the preparation temperature on the difference of the creep behavior were discussed and explained using the microstructure analyses of the tests’ samples.

show abstract

“…In other words, the method generally improves the mechanical properties of processed work pieces without deteriorating their lifetime or performance. However, its overall effect depends on several factors, primarily the processing parameters and the type of swaged material [30][31][32]. Among the main influencing factors is also the reduction ratio, which affects the depth of the penetration of the imposed strain and, thus, the distribution and homogeneity of the imposed strain across the cross-section of the work piece.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Thermomechanical Processing of Bimetallic Laminates

Kocich

2023

Materials

View full text Add to dashboard Cite

Thermomechanical processing combining plastic deformation and heat treatment is a favorable way to enhance the performance and lifetime of bimetallic laminates, especially those consisting of metals, which tend to form intermetallic layers on the interfaces when produced using methods involving increased temperatures. The presented work focuses on optimizing the conditions of thermomechanical treatment for an Al + Cu bimetallic laminate of innovative design involving a shear-strain-based deformation procedure (rotary swaging) and post-process heat treatment in order to acquire microstructures providing advantageous characteristics during the transfer of direct and alternate electric currents. The specific electric resistivity, as well as microhardness, was particularly affected by the structural features, e.g., grain size, the types of grain boundaries, and grain orientations, which were closely related to the applied thermomechanical procedure. The microhardness increased considerably after swaging (up to 116 HV02 for the Cu components), but it decreased after the subsequent heat treatment at 350 °C. Nevertheless, the heat-treated laminates still featured increased mechanical properties. The measured electric characteristics for DC transfer were the most favorable for the heat-treated 15 mm bimetallic laminate featuring the lowest measured specific electric resistivity of 22.70 × 10−9 Ωm, while the 10 mm bimetallic laminates exhibited advantageous behavior during AC transfer due to a very low power loss coefficient of 1.001.

show abstract

Influence of High Pressure Sliding and Rotary Swaging on Creep Behavior of P92 Steel at 500 °C

Cited by 6 publications

References 40 publications

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Influence of Cryo-Processing and Post-SPD Annealing on Creep Behavior of CP Titanium

Optimizing Thermomechanical Processing of Bimetallic Laminates

Contact Info

Product

Resources

About