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Vol.5 , No. 1, Publication Date: Apr. 16, 2019, Page: 9-17
, hyperfield microscope (HM), scanning electron microscope (SEM), X-ray diffraction (XRD) and micro-hardness. Electric resistance (ER) device was applied to reveal the effect of ε-Cu precipitate on ER, meanwhile, wear resistance was evaluated. The friction coefficient of 17-4PH steel aged for 5h was far greater than that of quenched state steel due to the hardness increment (+10.8HRC). Two types of martensite, blocky and lathy, were observed in the quenched steel without the appearance of retained austenite. It was found that the hardness of lathy martensite was superior to the blocky ones during aging, even though both undergoing synchronous rise of hardness during 5h-aging. The sudden drop of ER during aging from 0 to 0.5h, and rebound of ER during aging from 0.5h to 1.5h, was attributed to the interaction of dislocation and the morphological transion of ε-Cu precipitate, respectively. The hardness and wear resistance underwent an opposite trend compared to ER during aging from 0 to 5h.&picture=http://www.aascit.org/aascit/decorators/img/journal/891.jpg)
| [1] | Wenfei Xie, Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai, China; School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, China. |
| [2] | Wenyun Wu, Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai, China; School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, China. |
| [3] | Lianjin Yang, Zhejiang Tsingshan Steel Co., LTD., Zhejiang, China. |
| [4] | Fei Zhou, Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai, China; School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, China. |
| [5] | Shungui Zuo, Zhejiang Tsingshan Steel Co., LTD., Zhejiang, China. |
| [6] | Yuanming Huo, School of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai, China. |
| [7] | Xiaocheng Li, School of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai, China. |
| [8] | Riming Wu, Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai, China; School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, China. |
Stability of martensite in 480°C-aged 17-4PH steels were studied by Optical micrograph (OM), hyperfield microscope (HM), scanning electron microscope (SEM), X-ray diffraction (XRD) and micro-hardness. Electric resistance (ER) device was applied to reveal the effect of ε-Cu precipitate on ER, meanwhile, wear resistance was evaluated. The friction coefficient of 17-4PH steel aged for 5h was far greater than that of quenched state steel due to the hardness increment (+10.8HRC). Two types of martensite, blocky and lathy, were observed in the quenched steel without the appearance of retained austenite. It was found that the hardness of lathy martensite was superior to the blocky ones during aging, even though both undergoing synchronous rise of hardness during 5h-aging. The sudden drop of ER during aging from 0 to 0.5h, and rebound of ER during aging from 0.5h to 1.5h, was attributed to the interaction of dislocation and the morphological transion of ε-Cu precipitate, respectively. The hardness and wear resistance underwent an opposite trend compared to ER during aging from 0 to 5h.
Keywords
17-4PH Stainless Steel, Hyperfield Microscope (HM), Electric Resistance (ER), ε-Cu Precipitate, Morphological Transion
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