Ultrasonic and conventional electromagnetic resonance fatigue tests were conducted on notched and smooth specimens of ultrafine-grained steels. The notched specimens developed no internal fractures but showed a fatigue limit. In this case, ultraso...
H. Qiu   L. N. Wang   T. Hanamura   S. Torizuka   
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 536 269-272 2012年2月 [査読有り]
The work-hardening exponent is used to quantify the work-hardening of ultrafine-grained steels. The exponent for the types of steel with the carbon content below 0.22 wt% is proposed to be directly predicted by either yield strength or ferrite gra...
The crystal grain size of the work material is relatively large compared to the removal depth in micro-scale cutting. Therefore, the micromilling requires the small crystal grains in the material to machine accurate products in a stable manner. Th...
International Journal of Automation Technology 6(6) 802-808 2012年 [査読有り]
Ultra fine grained steels have been developed by many researchers. However, studies on the effects of different grain size on processes and product functions have been limited because the size of the bulk material has been small for these products...
Shiro Torizuka   Eijiro Muramatsub   S. V S Narayana Murty   
Materials Science Forum 710 19-26 2012年 [査読有り]
While uniform elongation is a measure of ductility of the material, reduction in area in tensile tests is also an important measure of ductility. Ultrafine-grained steels with different carbon contents from ultralow carbon to high carbon were prod...