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Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method

1
State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
2
Technology Center, Chongqing Gearbox Co., Ltd., Chongqing 402263, China
3
College of Mechanical Engineering, University of South China, Hengyang 421001, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(1), 125; https://doi.org/10.3390/met10010125 (registering DOI)
Received: 12 December 2019 / Revised: 11 January 2020 / Accepted: 13 January 2020 / Published: 15 January 2020
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 (h0.1° is the corresponding depth), when h > h0.1°, the yield strength calculated by the Ma model started to disperse at the depth of h0.1°. These results provide useful insight into the local mechanical properties of 18CrNiMo7-6 steel after carburizing and quenching treatment. View Full-Text
Keywords: 18CrNiMo7-6 steel; carburizing and quenching treatment; indentation size effect; nanoindentation 18CrNiMo7-6 steel; carburizing and quenching treatment; indentation size effect; nanoindentation
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Zhou, G.; Guo, J.; Zhao, J.; Tang, Q.; Hu, Z. Nanoindentation Properties of 18CrNiMo7-6 Steel after Carburizing and Quenching Determined by Continuous Stiffness Measurement Method. Metals 2020, 10, 125.

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