This document specifies micrographic methods of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 3.1 Grains <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 3.2 General <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6.1 Test location 6.2 Revealing ferritic grain boundaries 6.3 Revealing austenitic and prior-austenitic grain boundaries 6.3.1 General <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 7.1 General 7.1.1 Characterization methods 7.1.2 Formulae 7.1.3 Accuracy of the methods 7.2 Comparison method <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 7.3 Planimetric method <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 7.4 Intercept method 7.4.1 General <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 7.4.2 Linear intercept method <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7.4.3 Circular intercept method 7.4.4 Assessment of results <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.5 Other methods <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Steels. Micrographic determination of the apparent grain size<\/b><\/p>\n |