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Carbon—Iron Alloys: Hardening and Hardenability
| Content Provider | Scilit |
|---|---|
| Author | Sverdlin, Alexey |
| Copyright Year | 2016 |
| Description | For heat treatment, hardenability is very useful and important property of steel. It determines the rate at which the given steel should be quenched. It also tells about the maximum hardness that can be achieved on surface of steel of large cross-section bars, subjected to fast quenching. Hardening is heating and then cooling at such a rate of steel alloys so that a significant increase in hardness occurs. In most cases, hardening is performed in connection with a subsequent new heating, the tempering. The hardening process of workpieces can be divided into three technical steps. First, the workpart is heated so that the output structure transforms into an austenitic structure. This austenitizing temperature depends on the material used (750–1210°C). Then the workpart is maintained at this temperature so that alloying elements can be incorporated homogenously in this austenitic structure. The final step is quenching the workpiece at such a cooling rate that a so-called martensitic structure is originated. The heating and temperature maintenance should be performed in a protective atmosphere to protect the material from oxidation and decarburization. Cooling can be performed in different media. The most common are: water, saline water, hardening oils, polymers, salt bath, nitrogen, and argon. After hardening steel has a relatively high brittleness and so it usually cannot be case-hardened in this condition. Therefore, directly after hardening it must be tempered at least once, however, more times is better. Book Name: Encyclopedia of Iron, Steel, and Their Alloys |
| Related Links | https://api.taylorfrancis.com/content/chapters/edit/download?identifierName=doi&identifierValue=10.1081/E-EISA-120053679&type=chapterpdf |
| Ending Page | 566 |
| Page Count | 17 |
| Starting Page | 550 |
| DOI | 10.1081/e-eisa-120053679 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2016-01-13 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Encyclopedia of Iron, Steel, and Their Alloys Structure Heating Hardening Salt Quenching Austenitic Workpart Hardness Step Alloys |
| Content Type | Text |
| Resource Type | Chapter |
