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| Study of the Effects of Vanadium Content on the Structure and Mechanical Properties of 7Cr17 Stainless Steel for Refiner Plate |
| Received:June 30, 2025 Revised:July 30, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.01.020 |
| Key Words:7Cr17 stainless steel VC carbide microstructure impact toughness |
| Fund Project:山东省科技型中小企业创新能力提升项目（2024TSGC0319，2022TSGC2246）；山东省淄博市重点研发计划基金资助项目（2021XCYF0010）；山东省自然科学基金面上项目（ZR2020ME009）。 |
| Author Name | Affiliation | Postcode | | HOU Liyue* | College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 | | NIU Jiangting | Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | WANG Huiqiu | Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | SUN Zhenzhao | College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 | | MOU Xiangzhong | Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | ZHAO Ping* | College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 |
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| Abstract:This study investigated the effects of vanadium(V) content on the microstructure， precipitated carbides， and mechanical properties of 7Cr17 stainless steel used for grinding discs. The specimens were examined and analyzed using a metallurgical microscope， scanning electron microscope， Rockwell hardness tester， and other equipment， thereby determining an appropriate amount of V addition. The results revealed that the stainless steel microstructure consisted of lath martensite， carbides， and retained austenite. With the addition of V， the amount of vanadium carbide (VC) in the microstructure increased and its dispersion degree enhanced； however， when the addition amount reached 0.5%， carbide aggregation and growth occurred. The finely dispersed VC carbides effectively hindered dislocation movement， improving the Rockwell hardness of the stainless steel. When a small amount of V was added， the finely dispersed VC could pin dislocations， delay crack initiation， and enhance the impact toughness of the specimens. However， excessive V addition led to the massive precipitation of carbides at grain boundaries or within grains， resulting in stress concentration and material embrittlement. When 0.15% to 0.3% of V was added， the VC exhibited a high degree of dispersion， and the stainless steel demonstrated the best overall performance. |
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