Influence of production process chain on grain size stability of a microalloyed 20CrMo5 case hardening steel

2010 ◽  
Vol 4 (4) ◽  
pp. 166-170 ◽  
Author(s):  
B. Clausen ◽  
R. Kohlmann ◽  
F. Hoffmann
Keyword(s):  
Grain Size ◽  
Production Process ◽  
Case Hardening ◽  
Process Chain ◽  
Size Stability ◽  
Case Hardening Steel ◽  
Grain Size Stability

scholarly journals Process chain for the manufacture of hybrid bearing bushings

2021 ◽  
Vol 15 (2) ◽  
pp. 137-150
Author(s):  
Susanne Elisabeth Thürer ◽  
Anna Chugreeva ◽  
Norman Heimes ◽  
Johanna Uhe ◽  
Bernd-Arno Behrens ◽  
...  
Keyword(s):  
Extrusion Process ◽  
Steel Tube ◽  
Case Hardening ◽  
Process Chain ◽  
Forming Process ◽  
Die Forging ◽  
Material Contact ◽  
Hybrid Bearing ◽  
Case Hardening Steel ◽  
Tailored Forming

AbstractThe current study presents a novel Tailored Forming process chain developed for the production of hybrid bearing bushings. In a first step, semi-finished products in the form of locally reinforced hollow profiles were produced using a new co-extrusion process. For this purpose, a modular tool concept was developed in which a steel tube made of a case-hardening steel, either C15 (AISI 1015) or 20MnCr5 (AISI 5120), is fed laterally into the tool. Inside the welding chamber, the steel tube is joined with the extruded aluminum alloy EN AW-6082. In the second step, sections from the compound profiles were formed into hybrid bearing bushings by die forging. In order to set the required forming temperatures for each material—aluminum and steel—simultaneously, a tailored heating strategy was developed, which enabled successful die forging of the hybrid workpiece to the desired bearing bushing geometry. Using either of the case-hardening steels in combination with aluminum, this novel process chain made it possible to produce intact hybrid bearing bushings, which showed both macroscopically and microscopically intimate material contact inside the compound zone.

Grain size stability in a cryomilled nanocrystalline Al alloy powders containing diamantane nanoparticles

2019 ◽  
Vol 746 ◽  
pp. 290-299 ◽  
Author(s):  
W. Hanna ◽  
K. Maung ◽  
M. Enayati ◽  
J.C. Earthman ◽  
F.A. Mohamed
Keyword(s):  
Grain Size ◽  
Al Alloy ◽  
Size Stability ◽  
Grain Size Stability

High grain size stability of nanocrystalline Al prepared by mechanical attrition

2001 ◽  
Vol 16 (12) ◽  
pp. 3451-3458 ◽  
Author(s):  
F. Zhou ◽  
J. Lee ◽  
S. Dallek ◽  
E. J. Lavernia
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Thermally Activated ◽  
Transmission Electron ◽  
Mechanical Attrition ◽  
Size Stability ◽  
Grain Growth Kinetics ◽  
Grain Size Stability

Grain growth in nanocrystalline (nc) Al with a grain size of 26 nm produced by cryogenic mechanical milling was studied through x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Grain growth kinetics resembled those of ball-milled nc Fe. For homologous temperatures (T/TM) of 0.51–0.83, the time exponent n from D1/n − D01/n = kt was 0.04–0.28, tending toward 0.5 as T/TM increased. Two grain-growth regimes were distinguished: below T/TM = 0.78 growth ceased at an approximate grain size of 50 nm while at higher temperatures, grain growth proceeded steadily to the submicrometer range. Grain growth over the range of temperatures studied cannot be explained in terms of a single thermally activated rate process. The observed high grain size stability was attributed primarily to impurity pinning drag associated with the grain growth process.

Grain size stability of nanocrystalline cryomilled Fe-3wt.%Al alloy

1997 ◽  
Vol 9 (1-8) ◽  
pp. 71-74 ◽  
Author(s):  
R.J. Perez ◽  
H.G. Jiang ◽  
E.J. Lavernia
Keyword(s):  
Grain Size ◽  
Al Alloy ◽  
Size Stability ◽  
Grain Size Stability

scholarly journals Gradatim Ferociter : Exploring the Grain Size Stability of Heterogeneous Copper in Thermal Mechanical and Radiation Environments.

2020 ◽  
Author(s):  
Suveen Mathaudhu ◽  
Heather Salvador ◽  
Trevor Clark ◽  
Evander Ramos ◽  
Sina Shahrezaei ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Stability ◽  
Grain Size Stability

scholarly journals Contact Geometry Modification of Friction-Welded Semi-Finished Products to Improve the Bonding of Hybrid Components

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 115
Author(s):  
Bernd-Arno Behrens ◽  
Johanna Uhe ◽  
Tom Petersen ◽  
Florian Nürnberger ◽  
Christoph Kahra ◽  
...  
Keyword(s):  
Tensile Tests ◽  
Case Hardening ◽  
Process Chain ◽  
Forming Process ◽  
X Ray ◽  
Front End ◽  
Transition Area ◽  
Hardness Tests ◽  
Bonded Joint ◽  
Case Hardening Steel

To improve the bond strength of hybrid components when joined by friction welding, specimens with various front end surface geometries were evaluated. Rods made of aluminum AA6082 (AlSi1MgMn/EN AW-6082) and the case-hardening steel 20MnCr5 (AISI 5120) with adapted joining surface geometries were investigated to create both a form-locked and material-bonded joint. Eight different geometries were selected and tested. Subsequently, the joined components were metallographically examined to analyze the bonding and the resulting microstructures. The mechanical properties were tested by means of tensile tests and hardness measurements. Three geometrical variants with different locking types were identified as the most promising for further processing in a forming process chain due to the observed material bond and tensile strengths above 220 MPa. The hardness tests revealed an increase in the steel’s hardness and a softening of the aluminum near the transition area. Apparent intermetallic phases in the joining zone were analyzed by scanning electron microscopy (SEM) and an accumulation of silicon in the joining zone was detected by energy-dispersive X-ray spectroscopy (EDS).

Grain size stability and hardness in nanocrystalline Cu–Al–Zr and Cu–Al–Y alloys

2014 ◽  
Vol 598 ◽  
pp. 217-223 ◽  
Author(s):  
D. Roy ◽  
B.V. Mahesh ◽  
M.A. Atwater ◽  
T.E. Chan ◽  
R.O. Scattergood ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Stability ◽  
Grain Size Stability
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