2 results listed
In the present study, the effect of section thickness on
the austemperability of Cu alloyed GGG-70 (EN-GJS-700-3)
nodular cast iron automotive crankshafts have been investigated.
Crankshafts were austenized at 950 °C for 2 h and austempered
at 350 for 90 and 120 min. Optical microcope equipped with
image analyse software was used to perform microstructural
investigation and hardness tests were done to determine
mechanical properties. It was shown that section thickness had
important influence on austemperability. In the thin sections,
ausferrite microstructure has been observed, whereas, in the
thick sections, pearlite was formed to due to insufficient cooling
rate.
International Iron & Steel Symposium
UDCS
Ali Keleş
Gönül Coşkun
Mehmet Yıldırım
This steel teeth and coupons were produced by the
casting process. Steel having MC chemical content was alloyed
with 0.15 (MC15) and 0.20 (MC20) % wt. Ti. Respectively,
normalizing, quenching and tempering heat-treatment were
carried out for improved mechanical properties. The typical lath
martensite structure in martensitic steels was observed when
microstructure of specimens investigated via an optical
microscope. Mechanical properties of heat-treated specimens
were determined to use of tensile and hardness test. Wear
behaviors of MC, MC15, and MC20 specimens were found out
with the pin-on-disk test device. The field test was done for teeth.
Working life, volume changes of teeth were calculated as a result
of this field test.
International Iron & Steel Symposium
UDCS
Ali Keleş
Mehmet Yıldırım
Gönül Coşkun