statistical and graphical assessment of circumferential and radial hardness variation of aisi 4140, aisi 1020 and aa 6082 aluminum alloy统计和图形评估符合美国钢铁协会的4140的周向和径向硬度变化,符合美国钢铁协会的1020和aa 6082铝合金.pdf

Materials 2012, 5, 12-26; doi:10.3390/ma5010012 OPEN ACCESS materials ISSN 1996-1944 /journal/materials Article Statistical and Graphical Assessment of Circumferential and Radial Hardness Variation of AISI 4140, AISI 1020 and AA 6082 Aluminum Alloy Hamad Al-Khalid, Ayman Alaskari and Samy Oraby * Department of Mechanical Production Technology, College of Technological Studies, The Public Authority of Applied Education and Training (PAAET), P.O. Box 38322, Dhaya Abdalla Alsalim 72254, Kuwait; E-Mails: hk.alkhalid@.kw (H.A.-K.); aalaskai@ (A.A.) * Author to whom correspondence should be addressed; E-Mail: samyoraby@; Tel.: +965 Fax: +965 Received: 17 October 2011; in revised form: 6 December 2011 / Accepted: 15 December 2011 / Published: 23 December 2011 Abstract: Hardness homogeneity of the commonly used structural ferrous and nonferrous engineering materials is of vital importance in the design stage, therefore, reliable information regarding material properties homogeneity should be validated and any deviation should be addressed. In the current study the hardness variation, over wide spectrum radial locations of some ferrous and nonferrous structural engineering materials, was investigated. Measurements were performed over both faces (cross-section) of each stock bar according to a pre-specified stratified design, ensuring the coverage of the entire area both in radial and circumferential directions. Additi