Hot Hardness Testing
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What is hot hardness testing?Hot hardness testing is the measurement of material hardness while at elevated temperature. Hot hardness can be valuable for assessing and comparing materials, such as tool steels and wear resistant coatings, which are used in high temperature applications such as valve seats and dies.
Solving high temperature hardness issuesBecause room temperature hardness changes relatively little after high temperature exposure, it cannot be used to assess high-temperature properties. However, hardness-at-temperature changes significantly and reflects high temperature properties and problems such as tempering, abrasive wear, erosion and "hot erosion," stress and creep rupture, aging, sliding wear, softening, creep deformation, and workability issues. It can also cause galling, which is the adhesive wear and transfer of material between metallic surfaces during sheet metal forming and other industrial applications. Galling often occurs with aluminium compounds and is a common cause of tool breakdown.
Benefits of hot hardness testingHot hardness can characterize a material more quickly and inexpensively than hot tensile, prototype, or service testing because multiple temperatures and exposure times can be tested in a single hot hardness test run. This makes hot hardness testing an excellent way to compare multiple materials at elevated temperature.
How Stork experts conduct hot hardness testingStork Climax Research Services in Wixom, Michigan, is one of the very few commercial laboratories with hot hardness testing capabilities. Stork CRS conducts hot hardness testing similarly to normal Vickers hardness testing, except that the test is conducted inside a vacuum chamber at an elevated temperature. Read more details about how Stork conducts hot hardness testing.
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