Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method
In this work, the nanomechanical properties involving the indentation size effect (ISE) and yield strength of a surface-modified layer of 18CrNiMo7-6 steel after case hardening were investigated via nanoindentation experiments. The experimental results showed that the hardness increased with an incr...
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MDPI AG
2020-01-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/1/125 |
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| author | Guiyuan Zhou Jian Guo Junyu Zhao Qian Tang Zhaonan Hu |
| author_facet | Guiyuan Zhou Jian Guo Junyu Zhao Qian Tang Zhaonan Hu |
| author_sort | Guiyuan Zhou |
| collection | DOAJ |
| description | In this work, the nanomechanical properties involving the indentation size effect (ISE) and yield strength of a surface-modified layer of 18CrNiMo7-6 steel after case hardening were investigated via nanoindentation experiments. The experimental results showed that the hardness increased with an increase in strain rate; the contact stiffness versus indentation depth curves take the form of upper convexity due to residual compressive stress relaxation. On the basis of the Ruiz-Moreno model, a modified model considering the cutoff parameter as a function of indentation depth was proposed. This model was able to better describe the ISE of the surface-modified layer. With the Hough transform error angle of 0.1° as the critical value (<i>h</i><sub>0.1°</sub> is the corresponding depth), when <i>h</i> > <i>h</i><sub>0.1°</sub>, the yield strength calculated by the Ma model started to disperse at the depth of <i>h</i><sub>0.1°</sub>. These results provide useful insight into the local mechanical properties of 18CrNiMo7-6 steel after carburizing and quenching treatment. |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-13T04:41:50Z |
| publishDate | 2020-01-01 |
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| spelling | doaj.art-af65223c40d940a19dab0e773bdf7cae2022-12-22T03:01:58ZengMDPI AGMetals2075-47012020-01-0110112510.3390/met10010125met10010125Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement MethodGuiyuan Zhou0Jian Guo1Junyu Zhao2Qian Tang3Zhaonan Hu4State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, ChinaCollege of Mechanical Engineering, University of South China, Hengyang 421001, ChinaTechnology Center, Chongqing Gearbox Co., Ltd., Chongqing 402263, ChinaState Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, ChinaTechnology Center, Chongqing Gearbox Co., Ltd., Chongqing 402263, ChinaIn this work, the nanomechanical properties involving the indentation size effect (ISE) and yield strength of a surface-modified layer of 18CrNiMo7-6 steel after case hardening were investigated via nanoindentation experiments. The experimental results showed that the hardness increased with an increase in strain rate; the contact stiffness versus indentation depth curves take the form of upper convexity due to residual compressive stress relaxation. On the basis of the Ruiz-Moreno model, a modified model considering the cutoff parameter as a function of indentation depth was proposed. This model was able to better describe the ISE of the surface-modified layer. With the Hough transform error angle of 0.1° as the critical value (<i>h</i><sub>0.1°</sub> is the corresponding depth), when <i>h</i> > <i>h</i><sub>0.1°</sub>, the yield strength calculated by the Ma model started to disperse at the depth of <i>h</i><sub>0.1°</sub>. These results provide useful insight into the local mechanical properties of 18CrNiMo7-6 steel after carburizing and quenching treatment.https://www.mdpi.com/2075-4701/10/1/12518crnimo7-6 steelcarburizing and quenching treatmentindentation size effectnanoindentation |
| spellingShingle | Guiyuan Zhou Jian Guo Junyu Zhao Qian Tang Zhaonan Hu Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method Metals 18crnimo7-6 steel carburizing and quenching treatment indentation size effect nanoindentation |
| title | Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method |
| title_full | Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method |
| title_fullStr | Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method |
| title_full_unstemmed | Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method |
| title_short | Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method |
| title_sort | nanoindentation properties of 18crnimo7 6 steel after carburizing and quenching determined by continuous stiffness measurement method |
| topic | 18crnimo7-6 steel carburizing and quenching treatment indentation size effect nanoindentation |
| url | https://www.mdpi.com/2075-4701/10/1/125 |
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