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Journal of the Korean Society for Heat Treatment
Journal Basic Information
pISSN :
1225-1070
eISSN :
Journal DOI :
10.12656/jksht
Frequency :
Others
Publisher:
Korean Society for Heat Treatment
Editor in Chief :
Myng-Hoon Oh
Volume & Issues
Volume 27, Issue 6 - Nov 2014
Volume 27, Issue 5 - Sep 2014
Volume 27, Issue 4 - Jul 2014
Volume 27, Issue 3 - May 2014
Volume 27, Issue 2 - Mar 2014
Volume 27, Issue 1 - Jan 2014
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1
Effect of Composition in Cu-Al-Mn Shape Memory Alloys on the Shape Memory Properties and Cold Workability
Park, Jong Bae ; Park, Hyun Gyoon ;
Journal of the Korean Society for Heat Treatment, volume 27, issue 2, 2014, Pages 59~64
DOI : 10.12656/jksht.2014.27.2.59
Abstract
Cu-Al-Mn shape memory alloys of a variety of composition were characterized in terms of shape memory properties and cold workability. Cold workability tested by cold rolling indicated that the alloys solution treated in the
region have a higher ductility than those solution treated in the
region. Also it is known that cold workability increased with the decrease in Al content in the
region. This seems to be resulted from the fact that Mn addition causes to expand
region toward lower Al content and lower order-disorder transition temperature, consequently,
of excellent workability being frozen even at room temperature. Experimental results regarding shape memory showed that the properties were better with a higher Al contents at a given Mn content, which is closely related with martensitic transformation. It is also shown that super elasticity limit was enhanced with decrease in the yield strength of alloys because a lower yield strength seems to initiates slip at the lower applied stress.
2
A Study on Tribological Characteristics of Powder Sintered Fe-base Alloy (SMF9060)
Kim, Sang Youn ; Kim, Dae Wook ; Park, Yeong Min ; Shin, Dong Chul ; Kim, Tae Gyu ;
Journal of the Korean Society for Heat Treatment, volume 27, issue 2, 2014, Pages 65~71
DOI : 10.12656/jksht.2014.27.2.65
Abstract
SMF9060 material is a Fe-based powder sintered alloy that is used for several automobile components such as Synchronize Hub, oil pump and transmission. These components are required excellent wear resistance and durability. In this study, we have performed a dry wear test at the ambient air and Ar gas conditions in the room temperature, and a lubricant wear test at the room temperature and engine oil temperature of
. The amount of wear volume and coefficient friction are measured by a Profilometer and a Ball on disk type wear tester. The wear volume in Ar gas condition was a little higher than that in the ambient air condition. However the wear volume in the lubricant wear condition was much lower than in the dry wear condition. XRD analysis of the debris in Ar gas condition showed that the oxide film was not formed.
3
Isothermal Transformation Behavior of 10% Cr Heat Resistant Steel Fabricated by Centrifugal Casting Process
Kim, J.E. ; Lee, J.H. ; Kim, D.H. ; Yoo, W.D. ; Lee, J.H. ;
Journal of the Korean Society for Heat Treatment, volume 27, issue 2, 2014, Pages 72~78
DOI : 10.12656/jksht.2014.27.2.72
Abstract
Isothermal transformation behavior of a 10% Cr heat resistant steel fabricated by centrifugal casting process was investigated. Normalized specimen at
for 1 hour was isothermally annealed at temperature range between
and
with various time. The annealed specimen had eutectoid structure which was generated along austenitic grain boundary during isothermal annealing. Areal fraction of eutectoid structure increased up to 25% after holding at
for 20 hours. It was observed that austenitic matrix was transformed to ferrite structure and fine
carbides with increase of annealing time. Time-temperature-transformation diagram of the centrifugally cast 10% Cr steel with 0.18 wt% C was plotted based on the results of isothermal transformation behavior.
4
Effect of Carbon on Microstructure and Texture in Low Carbon Steels
Jeong, Woo Chang ;
Journal of the Korean Society for Heat Treatment, volume 27, issue 2, 2014, Pages 79~89
DOI : 10.12656/jksht.2014.27.2.79
Abstract
The effect of carbon on the microstructure and texture of low carbon steels was investigated in a series of 1.6 Mn-0.3Cr-0.2Mo-0.001B steels with carbon ranging from 0.021 to 0.048%. Intensity of {111} orientation increased with decreasing the carbon content, resulting in the increase in
value. The highest
value of 1.30 was obtained in 0.021%C steel annealed at
according to the typical galvannealing heat cycle. Martensite volume fraction was not substantially affected by the annealing temperature. It was found that the fine and uniformly distributed martensite particles which were present in amounts of about 5% volume fraction were desirable for the highest
value. The other factor affecting the high
value was the preferred epitaxial growth of retained ferrite with {111} orientation into austenite during cooling.