A New Method for Evaluating the Indentation Toughness of Hardmetals
This paper proposes a new method of evaluating the indentation toughness of hardmetals using the length of Palmqvist cracks (C) and Vickers indentation diagonal size (di). Indentation load “P” is divided into two parts: Pi for plastic indentation size and Pc for Palmqvist cracks....
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-05-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/8/5/197 |
| _version_ | 1828117239568531456 |
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| author | Prem C. Jindal |
| author_facet | Prem C. Jindal |
| author_sort | Prem C. Jindal |
| collection | DOAJ |
| description | This paper proposes a new method of evaluating the indentation toughness of hardmetals using the length of Palmqvist cracks (C) and Vickers indentation diagonal size (di). Indentation load “P” is divided into two parts: Pi for plastic indentation size and Pc for Palmqvist cracks. Pi depends upon the square of the indentation size (di2) and Pc depends upon (C3/2). The new method produces a very good linear relationship between the calculated indentation toughness values and the standard conventional linear elastic fracture mechanics toughness values with the same cemented carbide materials for a large number of standard Kennametal grades for both straight WC-Co carbide grades and grades containing cubic carbides. The new method also works on WC-Co hardmetal data selected from recently published literature. The technique compares the indentation toughness values of WC-Co materials before and after vacuum annealing at high temperature. The indentation toughness values of annealed carbide samples were lower than for un-annealed WC-Co hardmetals. |
| first_indexed | 2024-04-11T13:11:04Z |
| format | Article |
| id | doaj.art-03bf09086b8b4d6f91edb0b7abf63036 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-11T13:11:04Z |
| publishDate | 2018-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-03bf09086b8b4d6f91edb0b7abf630362022-12-22T04:22:34ZengMDPI AGCrystals2073-43522018-05-018519710.3390/cryst8050197cryst8050197A New Method for Evaluating the Indentation Toughness of HardmetalsPrem C. Jindal0Independent Scholar, 615 Westchester Drive, Greensburg, PA 15601, USAThis paper proposes a new method of evaluating the indentation toughness of hardmetals using the length of Palmqvist cracks (C) and Vickers indentation diagonal size (di). Indentation load “P” is divided into two parts: Pi for plastic indentation size and Pc for Palmqvist cracks. Pi depends upon the square of the indentation size (di2) and Pc depends upon (C3/2). The new method produces a very good linear relationship between the calculated indentation toughness values and the standard conventional linear elastic fracture mechanics toughness values with the same cemented carbide materials for a large number of standard Kennametal grades for both straight WC-Co carbide grades and grades containing cubic carbides. The new method also works on WC-Co hardmetal data selected from recently published literature. The technique compares the indentation toughness values of WC-Co materials before and after vacuum annealing at high temperature. The indentation toughness values of annealed carbide samples were lower than for un-annealed WC-Co hardmetals.http://www.mdpi.com/2073-4352/8/5/197WC-CO cemented carbide materialsVickers hardnessPalmqvist indentation cracksindentation toughnesslinear elastic fracture mechanics toughness, KIC, GIC |
| spellingShingle | Prem C. Jindal A New Method for Evaluating the Indentation Toughness of Hardmetals Crystals WC-CO cemented carbide materials Vickers hardness Palmqvist indentation cracks indentation toughness linear elastic fracture mechanics toughness, KIC, GIC |
| title | A New Method for Evaluating the Indentation Toughness of Hardmetals |
| title_full | A New Method for Evaluating the Indentation Toughness of Hardmetals |
| title_fullStr | A New Method for Evaluating the Indentation Toughness of Hardmetals |
| title_full_unstemmed | A New Method for Evaluating the Indentation Toughness of Hardmetals |
| title_short | A New Method for Evaluating the Indentation Toughness of Hardmetals |
| title_sort | new method for evaluating the indentation toughness of hardmetals |
| topic | WC-CO cemented carbide materials Vickers hardness Palmqvist indentation cracks indentation toughness linear elastic fracture mechanics toughness, KIC, GIC |
| url | http://www.mdpi.com/2073-4352/8/5/197 |
| work_keys_str_mv | AT premcjindal anewmethodforevaluatingtheindentationtoughnessofhardmetals AT premcjindal newmethodforevaluatingtheindentationtoughnessofhardmetals |