Abstract： AS 1544.5:2003 pdf download.Methods for impact tests on metals Part 5: Assessment of fracture surface appearance of steel. As crystalline and fibrous areas of a fracture surface of the brokeii test piece can he distinguished visually by the...

AS 1544.5:2003 pdf download.Methods for impact tests on metals Part 5: Assessment of fracture surface appearance of steel.

As crystalline and fibrous areas of a fracture surface of the brokeii test piece can he distinguished visually by their appearance when viewed from several angles under a point source of light or under parallel light, the percentage of each type of fracture

surface present may be determined by—

(a) direct visual estimation;

(b) direct measurement without magnification: or

(c) measurement with magnification.

NOTE: Methods (a) and (b) may not be suitable where there are several areas of crystallinity. as may occur in weld metal.

4.1.3 Accuracy

An accuracy of±1O percent crystallinity or fibrosity can be achieved with methods (a) and (b) and ±5 percent with method (c).

4.2 Procedure for direct visual estimation. The procedure shall be as follows:

(a) Examine the fracture surface under a point source of light or under parallel light.

NOTES:

I An ordinary light bulb is preferable to strip lighting, and a small brilliant bulb in a reflector provides the best practical

contrast. Direct natural light is also satisfactory.

2 In some metals, such as fine-grained alloy steels, the facets in the crystalline fracture face are very small with the result

that the area appears dull and only of slightly lighter grey colour than the fibrous area.

In these circumstances, the area of crystallinity can best be distinguished by its dense granular texture compared with the spongy or silky texture of the fibrous area.

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