Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=20498#.VNHb9SzQrzE Author(s)    L.E. aUmoru , J.A. Ali , A.A. Afonja Affiliation(s) Department of Metallurgical and Materials Engineering,Obafemi Awolowo University, Ile-Ife, Nigeria. . Nigeria Building and Road Research Institute (NIBRRI)Garki, Abuja . Department of Metallurgical and Materials Engineering,Obafemi Awolowo University, Ile-Ife, Nigeria. . ABSTRACT This work has investigated the effect of austempering variables on hardness, strength and toughness of 0.48wt. % calcium treated cast iron. The iron was subjected to varying austenitizing and isothermal transformation temperatures and times. Samples were austenitized for 15, 30, 45 and 60 minutes at each of the temperatures 850, 875, 900, 925 and 950 degrees centigrade. Also for 950℃ and 60 minutes of austenitizing conditions, samples of the 0.48wt. % calcium treated irons were isothermally ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52754#.VKIPecCAM4 Author(s)    Osmar Rodrigues 1 , Mauro César Celaro Teixeira 1 , Edson Roberto Costenaro 1 , Leandro Vargas 1 , Rafael Damo 2 Affiliation(s) 1 Embrapa Wheat, Passo Fundo, Brazil . 2 University of Passo Fundo, Passo Fundo, Brazil . ABSTRACT A longer stem elongation phase (from the terminal spikelet-TS to the anthesis-ANT phases) increases grain production due to an increase in spikelet fertility. However, the mechanism behind the greater number of fertile flowers that occur when the duration of stem elongation is modified by photoperiod and vernalization is not fully understood. The goal of this study ...