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Tool Steels: Fracture Toughness
| Content Provider | Scilit |
|---|---|
| Author | Leskovšek, Vojteh Podgornik, Bojan |
| Copyright Year | 2016 |
| Description | The process parameters, the work material, and the tool material determine the dominant damage mechanism of the tool. For this reason, beside a detailed knowledge of the relevant damage mechanism, improving the tool's performance requires a well-defined description of the tool material properties' profile. Although the variety of tooling operations is enormous, there are some basic properties of the tool material that are very significant for almost all applications. These properties are ductility and toughness, which prevent crack initiation and propagation, consequent causing of fracture of the tool or tool edge due to local overloading, and hardness, which must be sufficiently high to avoid local plastic deformation. Hardness and toughness are in general mutually exclusive properties; however, they both greatly depend on the heat treatment procedure and parameters. When tools are subjected to loads, local stress concentrations occur next to the microstructure features, such as carbides, which depending on the size and orientation accelerate tool breakage. By means of heat treatment, the microstructure of steel can be changed, and within fairly wide boundaries the properties too, especially toughness. The most reliable measure of toughness is the plane-strain fracture toughness, with a high fracture toughness meaning that the tool will be more resistant to shock loadings as well as to the propagation of fatigue cracks. Although standardized fracture toughness testing is available, it is quite demanding in the case of hard and brittle materials. In particular, the manufacture of a sharp fatigue crack is difficult and expensive. This has promoted the search for alternative fracture toughness testing methods, with the use of circumferentially notched and fatigue precracked tensile specimens being found as one of the most promising ones. 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-120049739&type=chapterpdf |
| Ending Page | 3719 |
| Page Count | 33 |
| Starting Page | 3687 |
| DOI | 10.1081/e-eisa-120049739 |
| 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 Plastic Fracture Toughness Fatigue Treatment Stress Hardness |
| Content Type | Text |
| Resource Type | Chapter |
