Mechanical Testing is a process used to determine the strength of a material when force is applied. This includes properties such as hardness, ductility, impact resistance, and fracture toughness. This process can be used to determine the potential usefulness of a material for it’s intended application before it enters service.
There are several different types of mechanical testing that can be used to obtain information on different material properties. The ones that are performed by Hi-Tech Testing are Positive Material Identification, Hardness Testing, Chemical Etching/Response, Ferrite Content Testing, Chemical Testing, Tensile/Side –Bend testing and Mechanical Measurement.
- Positive Material Identification (PMI) is the process of identifying a metal alloy via the chemical analysis of its component elements. This can be done by in one of two ways, either by X-Ray Fluorescence (XRF) or by Optical Emission Spectroscopy (OES). Hi-Tech Testing utilizes the Niton XLP-818 Alloy Analyzer to identify and sort alloy materials using XRF technology.
- Hardness Testing is performed by causing an impact on a piece of material and measuring the results to determine the hardness of the material. Hi-Tech uses portable units in accordance with ASTM A956 (Equotip),ASTM A833 (Brinell) or ASTM A1038 (Microdur) to meet applicable client specifications. For Brinell an impact ball (indenter) is placed between the item and a test bar of known hardness and then struck with a hammer. Using a comparator (Brinell microscope) the two indentations are compared and a relative hardness value is derived. For Equotip a spring loaded impact body with a tungsten carbide tip is impacted upon the surface and by measuring the rebound, a hardness value is determined. The Microdur system uses a calibrated instrument that impacts a synthetic diamond-tipped body with a fixed velocity (generated by a spring force) onto a surface of the material under test. The Ultrasonic Contact Impedance (UCI) method measures the indentation electronically preventing the need for physical measurement of the indentation. The hardness is indicated on an electronic display.
- Chemical Etching/Response is a tightly controlled corrosion process in which chemicals are used to selectively remove metal from specific areas of a component. This process is commonly used to define weld boundaries or to detect and verify removal of arc strikes. Compared to other processes that do similar things, it is often cheaper and more cost effective.
- Ferrite Content Testing is a nondestructive examination method that involves acquiring data on the ferrite content of austenitic stainless steel and duplex materials. It is useful for understanding the mechanical properties, susceptibility to corrosion, and reliability of these materials.
- Chemical Testing is a process in which chemicals are used to determine the properties of a material. For example, Copper Sulfate solution can be used to determine the presence or absence of stainless steel on a carbon steel substrate, a Ferroxyl solution can be used to detect the presence of carbon contamination of a stainless steel.
Contact us today to learn more about Hi-Tech Testing’s mechanical testing capabilities.