The Applied Technical Services Family of Companies (FoC) verifies the alignment of X-ray diffraction (XRD) instruments in accordance with the ASTM E915 standard.
What is ASTM E915?
The American Society for Testing and Materials developed the ASTM E915 standard as a resource for those verifying the alignment of XRD instruments that measure residual stress. The standardโs primary objective is to ensure that the instrumentโs three rotation axes ( ฮธ, 2ฮธ, and ฯ) coincide correctly, enabling experts to quantify and reduce systemic experimental error in XRD residual stress measurement.
The ASTM E915 Test Procedure
To conduct the ASTM E915 test procedure properly, the XRD instruments must be aligned according to the manufacturer’s specifications. Regardless of if they are fixed or variable, the ฯ, ฮธ, and 2ฮธ axes should coincide. Technicians should center the X-ray beam on the 2ฮธ and axes with a focus range that ensures the desired precision and error tolerances. Technicians should confirm that the ฯ and 2ฮธ axes, the slit positioned at 2ฮธ equals zero degrees, and the x-ray tube focal spot should be placed on a line in the plane of diffraction. The X-rayโs peak should have the highest diffraction angle, which is also consistent with peak intensity. Iron powder that has a particle size above 1 ยตm is the ideal stress-free iron specimen, but powders via plastically deformed filings can also be effective.
More About Our ASTM-compliant Testing Lab
Our A2LA-accredited lab supports companies in need of ASTM-compliant testing services. ASTM compliance is widely regarded and revered as the definitive benchmark for testing, confirming the reliability and safety of materials and products used in a wide range of industries. Our lab is staffed with experienced professionals capable of conducting comprehensive tests that provide critical insight into a test specimenโs performance under specific conditions and suitability for specific tasks. Our labโs services can help your business comply with ASTM E915 testing services and many other ASTM standards that evaluate metals, polymers, textiles, and many other materials.
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