1. Scope
1.1 The digital reference images provided in the adjunct to this standard illustrate various types and degrees of discontinuities occurring in thin-wall steel investment castings. Use of this standard for the specification or grading of castings requires procurement of the adjunct digital reference images that illustrate the discontinuity types and severity levels. They are intended to provide the following: 1.1.1 A guide enabling recognition of thin-wall steel casting discontinuities and their differentiation both as to type and degree through digital radiographic examination. 1.1.2 Example digital radiographic illustrations of discontinuities and a nomenclature for reference in acceptance standards,specifications, and drawings. 1.2 Two illustration categories are covered as follows: 1.2.1 Graded--Six common discontinuity types each illustrated in eight degrees of progressively increasing severity. 1.2.2 Ungraded--Twelve single illustrations of additional discontinuity types and patterns and imperfections not generally regarded as discontinuities. 1.3 The reference radiographs were developed for casting sections up to 1 in. [25.4 mm] in thickness. 1.4 All areas of this standard may be open to agreement between the cognizant engineering organization and the supplier, or specific direction from the cognizant engineering organization. These items should be addressed in the purchase order or the contract. NOTE 1--The set of digital reference images consists of 16 digital files, software to load the desired format, and specific instructions on the loading process. The 16 reference images illustrate 8 grades of severity in 6 common discontinuity types and 12 ungraded discontinuities and contain an image of a step wedge and 2 duplex-wire gauges. Refer to Practice E 2002 for wire pair details. 1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 These digital reference images are not intended to illustrate the types or degrees of discontinuities found in thin-wall investment castings when performing film radiography. If performing film radiography of thin-wall investment castings, refer to Reference Radiographs E 192. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.8 Only licensed copies of the software and images shall be used for production inspection. A copy of the ASTM/user license agreement shall be kept on file for audit purposes.
This standard will be used by commercial manufacturers of investment steel castings when using digital radiographic methods for quality assurance inspections. This standard is needed to update acceptance specifications for new technology digital radiographic methods.
Keywords
aerospace; discontinuities; investment castings; digital reference image; nickel; steel; X-ray
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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