3 results listed
Vickers microhardness values depended on the load
applied. Therefore, it would be beneficial to establish a
relationship between the results of the study made for the same
material. This relationship between the microhardness value and
the applied load is expressed as the track size effect (ISE), and it is
examined with ISE models and curve fitting equations. In this
study, AISI 1040 steels are investigated which have been the
quenched and different temperatures tempered. Load values
selected for experimental studies are total 7 values from 50 gram
to 2000 gram. The experimental results were compared with HaysKendall and MPSR models. The results showed that both ISE
models were compatible with similar sensitivity with the
experimental results. However, a correlation was found between
the Hays-Kendall model coefficients and the Vickers hardness
values. From this relationship, equations were obtained which
may be useful in comparing a hardness value measured using any
microhardness load with the results of different microhardness
loads.
International Iron & Steel Symposium
UDCS
Erdal Karadeniz
In this study, Vickers hardness values change of the
100Cr6 steel as a result of the induction surface hardening and
tempering were investigated. Load values selected for
experimental studies are total 7 values from 50 grams to 2000
grams. The experimental result curves were compared with
Meyer’s law, PSR, MPSR and Hays-Kendall models. Furthermore,
the most appropriate mathematical equation for experimental
curve was investigated. The comparison results showed that the
Matlab curve fitting model was the most concordant of the
equation obtained from the Power 2 Lar Trust-Region analysis.
International Iron & Steel Symposium
UDCS
Erdal Karadeniz
Aykut Argıncıklıgil
The gating and riser system (feeder) design play very important role for improving casting quality. Many defects such as tensile void, porosity and segregation in products produced by casting methods may be detected. The porosity is the one of the defects most frequently encountered in casting. Porosity formation cause costly scrap loss and limits the use of cast parts in applications requiring high sealing. The amount of porosity is closely related to sand casting process parameters. A considerable reduction in porosity formation can be obtained using riser design optimization technique in the sand casting process. The design of feeder requires knowledge and experience. Therefore, hot spot formation, solidification period, feeder sprue and volume are important criteria. However, these may be not enough to produce high quality castings, and the importance of simulation techniques increases. The aim of this study is to make a feeder design optimisation for a cast part produced from Etial 160 aluminium alloy by sand mould casting method. In this study, gating and riser design, module criteria, feeder volume and size were investigated by SOLIDCast casting simulation program. The real and simulated casting values were compared with each other in the light of macro and micro-porosity results.
International Iron & Steel Symposium
UDCS
Mustafa ERCAN
Erdal Karadeniz
Murat ÇOLAK