This document specifies a micrographic method 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 | ||||||
| 4<\/td>\n | European foreword Endorsement notice <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions 3.1 Grains <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 3.2 General 4 Symbols <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 5 Principle <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 6 Selection and preparation of the specimen 6.1 Test location <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6.2 Revealing ferritic grain boundaries 6.3 Revealing austenitic and prior-austenitic grain boundaries 6.3.1 General 6.3.2 \u201cBechet-Beaujard\u201d method by etching with aqueous saturated picric acid solution <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 6.3.3 \u201cKohn\u201d method by controlled oxidation <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 6.3.4 \u201cMcQuaid-Ehn\u201d method by carburization at 925 \u00b0C <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 6.3.5 Proeutectoid ferrite method <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.3.6 Bainite or gradient-quench method 6.3.7 Sensitization of austenitic stainless and manganese steels 6.3.8 Other methods for revealing prior-austenitic grain boundaries <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 7 Characterization of grain size 7.1 Characterization by an index 7.1.1 Formulae 7.1.2 Assessment by comparison with standard grain size charts <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 7.1.3 Planimetric method 7.1.4 Estimation of the index 7.2 Characterization by the intercept method 7.2.1 Linear intercept segment method <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7.2.2 Circular intercept segment method <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 7.2.3 Assessment of results <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 8 Test report <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Annex A (informative) Summary of methods for revealing ferritic, austenitic or prior-austenitic grain boundaries in steels <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Annex B (normative) Evaluation method <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Steels. Micrographic determination of the apparent grain size<\/b><\/p>\n |