Open AccessAcceptability analysis for determining the average grain size by ASTM E112 standard
Author(s) -
Geping Bi,
Yong Guan,
Xiaoyu Chen,
Wenfa Tan,
Wenniu Huang,
Yuqing Gao,
Meimei Wang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/770/1/012023
Subject(s) - grain size , limit (mathematics) , mathematics , statistics , standard deviation , materials science , metallurgy , mathematical analysis
In this paper, the ASTM grain size number of aluminium alloy specimen was determined by the Abrams three-circle procedure and planimetric procedure, according to ASTM E112-13 standard, and the measurement uncertainty was evaluated. Based on the test data and theoretical analysis, the %RA limit for acceptability of ASTM E112 grain size measurement was discussed. The following two corrections are made: when G is determined via the Abrams three-circle and planimetric procedures, the %RA limit should not exceed 8.4% and 16.1%, respectively, instead of earlier regulated value of 10%.