Microstructural refinement in an ultra-high strength martensitic steel via equal channel angular pressing

2018 ◽  
Vol 725 ◽  
pp. 57-64 ◽  
Author(s):  
S.L. Gibbons ◽  
R.A. Abrahams ◽  
M.W. Vaughan ◽  
R.E. Barber ◽  
R.C. Harris ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Martensitic Steel ◽  
High Strength ◽  
Microstructural Refinement ◽  
Angular Pressing

Mechanical Properties of Al6061 Processed by Equal Channel Angular Pressing

2012 ◽  
Vol 585 ◽  
pp. 392-396 ◽  
Author(s):  
Ankit Sahai ◽  
Rahul Swarup Sharma ◽  
K. Hans Raj ◽  
Narinder Kumar Gupta
Keyword(s):  
Mechanical Properties ◽  
Equal Channel Angular Pressing ◽  
Manufacturing Industry ◽  
High Strength ◽  
Load Variations ◽  
Outer Corner ◽  
Angular Pressing ◽  
Ecap Process ◽  
Circular Specimen ◽  
Number Of Passes

The severe plastic deformation (SPD) is an effective approach for producing bulk nanostructured materials. The Equal Channel Angular Pressing (ECAP) is the most efficient SPD solution for achieving ultra-fined grained (UFG) material as billet undergoes severe and large deformation. The process parameters of ECAP (Channel Angle, angle of curvature, friction, number of passes, etc) influences major impact on the properties. In present work, the ECAP process is performed by pressing a specimen through a die consisting of two intersecting channels meeting at an angle φ and outer corner meeting at an angle ψ. Experiments with a circular specimen of Al6061 were conducted to investigate the changes in mechanical properties upto 2 passes. 3-D finite element simulations were also performed using metal forming software FORGE to study the evolution of strain in the specimen during the ECAP process. Simulation results were investigated by comparing them with experimental measured data in terms of load variations. The present work clearly shows that ECAP caused accentuated increase in Al6061 hardness and tensile strength during multi-pass processing. This study is beneficial in developing high quality, high strength products in manufacturing industry on account of its ability to change microstructure of materials.

Preparation and Mechanical Properties of Ultra-Fine Grain Medium-Carbon Steel Based on Equal-Channel Angular Pressing

2015 ◽  
Vol 645-646 ◽  
pp. 427-434
Author(s):  
Jian Min Wang ◽  
Wen Tao Hou ◽  
Lin Lu
Keyword(s):  
Phase Transformation ◽  
Carbon Steel ◽  
Equal Channel Angular Pressing ◽  
Martensitic Steel ◽  
Medium Carbon Steel ◽  
Optimal Size ◽  
Tempering Temperature ◽  
Medium Carbon ◽  
Angular Pressing ◽  
Average Grain Size

A new technology of preparing submicron medium-carbon steel quickly using martensitic steel by equal-channel angular pressing is developed. The technology combines martensite phase transformation with severe plastic deformation. In this research, martensitic steel is heated to 923K quickly and held for appropriate time, then equal-channel angular pressing is implemented. Supersaturated ferrites of average grain size within 0.5μm are obtained by the interaction of dislocation intersection, dynamic recrystallization and strain-induced phase transformation. At the same time, strain-induced phase transformation leads to dispersive precipitation of supersaturated carbon particles in the form of carbide inside grains or in grain boundaries. The optimal size of ferrite grains and the optimal distribution of carbides are acquired by controlling tempering temperature and time. The results show that ultra-fine grained materials prepared by this technology possess superior thermal stability.

Microstructures and Tensile Properties of Maraging Steel Processed by Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 421-426 ◽  
Author(s):  
M.X. Yang ◽  
Gang Yang ◽  
Zheng Dong Liu ◽  
Cun Yu Wang ◽  
C.X. Huang
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Maraging Steel ◽  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Aging Treatment ◽  
Subsequent Aging ◽  
Microstructural Refinement ◽  
Angular Pressing ◽  
Narrow Bands

An 18Ni (C-250) maraging steel was successfully processed by equal channel angular pressing (ECAP) for a single pass at room temperature. Microstructural observations showed that the martensite laths of 18Ni maraging steel were elongated to more narrow bands with a width of 100-200 nm after ECAP deformation. After ageing treatment, many nano-sized precipitates distributed uniformly within the refined martensite lathes. In comparison with the tensile strength (1940 MPa) of general used steel (solution + aging treatment), the tensile strength of the sample processed by ECAP and subsequent aging treatment was enhanced for more than 100 MPa (above 2050 MPa). The enhancement of tensile properties was attributed to microstructural refinement and uniformly distributed nano-precipitates.

Microstructural study of an age hardenable martensitic steel deformed by equal channel angular pressing

2008 ◽  
Vol 491 (1-2) ◽  
pp. 172-176 ◽  
Author(s):  
M. Iranpour Mobarake ◽  
M. Nili-Ahmadabadi ◽  
B. Poorganji ◽  
A. Fatehi ◽  
H. Shirazi ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Martensitic Steel ◽  
Microstructural Study ◽  
Angular Pressing

Investigation on Three-Dimensional Microstructures and Tensile Properties of Pure Iron during Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 791-796
Author(s):  
Gang Yang ◽  
Mu Xin Yang ◽  
Zheng Dong Liu ◽  
Chang Wang ◽  
Chong Xiang Huang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Band Structure ◽  
Equal Channel Angular Pressing ◽  
Pure Iron ◽  
Three Dimensional ◽  
Microstructural Refinement ◽  
Angular Pressing ◽  
Transmission Electron

Commercial pure iron billets having diameter of 60 mm and length of 180 mm were subjected to equal channel angular pressing (ECAP) at 350 °C for 1-4 passes via route BC. Microstructural evolutions on three planes (X, Y, Z planes) were characterized by optical microscopy and transmission electron microscopy (TEM). It was found that after four passes an ultrafine microstructure could be formed on the X plane, but a band structure remained on the Z plane. Accordingly, the mechanical properties exhibited apparent dependence on the orientations. The strength in the X and Y directions was higher than that in the Z direction. The microstructural refinement and mechanical properties were discussed in terms of experimental results.

Achieving excellent ductility in high-strength Mg-10.6Gd-2 Ag alloy via equal channel angular pressing

2020 ◽  
Vol 817 ◽  
pp. 152688 ◽  
Author(s):  
Jiapeng Sun ◽  
Bingqian Xu ◽  
Zhenquan Yang ◽  
Hao Zhou ◽  
Jing Han ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Strength ◽  
Angular Pressing
Sign in / Sign up

Export Citation Format

Share Document