Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52938#.VKyorcnQrzE Author(s)    P. G. Mordovskoi , S. P. Yakovleva , S. N. Maharova Affiliation(s) Department of Material Science, The V.P. Larionov Institute of Physical and Technical Problems of the North SB RAS, Yakutsk, Russia . ABSTRACT This paper presents the results of equal channel angular pressing (ECAP) and subsequent heat treatment (HT) as a method to improve the wear resistance of metallic materials in friction sliding. The effect of ECAP and HT on the microstructure and mechanical properties of low carbon steel is investigated in this work. The mechanisms of wear resistance of steel with ultrafine and nanostructures produced by equal-channel angular pressing is analyzed. The results show that ECAP at room temperature and annealing at 350°C and 450°C can be used as a technology of reducing wear in friction sliding.   KEYWORDS ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50393#.VDzBTFfHRK0 Author(s)   Thibaud Bucquet , Udo Fritsching Affiliation(s) Process & Methods Department, IWT Bremen, Bremen, Germany . ABSTRACT Numerical simulations based on a conjugate heat transfer solver have been carried out to analyze various gas quenching configurations involving a helical gear streamed by an air flow at atmospheric pressure in a gas quenching chamber. In order to optimize the heat transfer coefficient distribution at key positions on the specimen, configurations involving layers of gears and flow ducts comprising single to multiple gears have been simulated and compared to standard batch configurations in gas quenching. Measu...