Hardenability is a measure of a steel's ability to be hardened by heat treatment, such as quenching. It is an important factor to consider when selecting steel for specific applications, as it affects the steel's final mechanical properties, such as strength and toughness. There are several methods used to determine the hardenability of steel, including the Jominy end-quench test and the Grossman method.
Determining Hardenability of Steel
There are several methods for determining the hardenability of steel, including the Jominy end-quench test, the Grossman test, and the Lorch test.
The Jominy End-Quench Test
The Jominy end-quench test is the most commonly used method for determining hardenability. It involves heating a sample of steel to a specified temperature and then quenching one end of the sample in the water while allowing the other end to cool slowly. The hardness of the quenched end is then measured at various distances from the quenched end, using a Rockwell or Brinell hardness tester. The resulting hardness values are then plotted on a Jominy hardenability curve, which shows the relationship between hardness and distance from the quenched end.
The Grossman Test
The Grossman test is a simpler method for determining hardenability, which involves measuring the depth of hardening on a sample of steel that has been heated to a specific temperature and then quenched in water. The depth of hardening is determined by measuring the distance from the quenched surface to the point where the hardness drops to a specified value, such as 50 HRC
The Lorch Test
The Lorch test is a method for determining hardenability that involves heating a steel sample to a specific temperature and then quenching it in a molten metal bath, such as lead or tin. The sample is then sectioned and the hardness is measured at various distances from the quenched surface, similar to the Jominy end-quench test.
Understanding the hardenability of steel can help to select the appropriate material for a given application, and ultimately improve the performance and reliability of the final product.
Video 01: Hardenability
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