金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 144-147.DOI: 10.13251/j.issn.0254-6051.2023.12.024

• 工艺研究 • 上一篇    下一篇

淬火温度对ø16 mm 35Si2Cr钢棒力学性能的影响

赵海凤, 于毫勇, 谭振宇   

  1. 北京铁科首钢轨道技术股份有限公司, 北京 102206
  • 收稿日期:2023-07-21 修回日期:2023-10-20 出版日期:2023-12-25 发布日期:2024-01-29
  • 作者简介:赵海凤(1982—),女,工程师,硕士,主要研究方向为预应力钢材,E-mail: fenger6789@163.com

Effect of quenching temperature on mechanical properties of ø16 mm 35Si2Cr steel bar

Zhao Haifeng, Yu Haoyong, Tan Zhenyu   

  1. Beijing Tieke Shougang Railway-tech Co., Ltd., Beijing 102206, China
  • Received:2023-07-21 Revised:2023-10-20 Online:2023-12-25 Published:2024-01-29

摘要: 研究了35Si2Cr钢热轧盘条在930、950、970、990及1010 ℃感应加热并喷水冷却淬火后的显微组织、维氏硬度及460 ℃感应加热并喷水冷却回火后的拉伸性能、冲击性能。结果表明,随着淬火温度从930 ℃升高至1010 ℃,35Si2Cr钢淬火显微组织中心区域都存在铁素体,且随着感应加热温度的升高,铁素体含量逐渐减少;心部区域组织存在的不均匀性使维氏硬度(深度6 mm至中心范围内)存在波动;表面至1/2半径范围内,1010 ℃下试验钢的淬火硬度最高,表明较高感应淬火温度有利于原材料组织的奥氏体均匀化;460 ℃回火温度下,试验钢在930~1010 ℃淬火温度区间的拉伸性能没有明显差别,当淬火温度达到1010 ℃时,试样的冲击性能最好。感应淬火温度为1010 ℃时,35Si2Cr钢可以获得较好的综合力学性能。

关键词: 35Si2Cr钢, 铁素体, 淬火温度, 冲击性能

Abstract: Microstructure, Vickers hardness of 35Si2Cr hot-rolled steel quenched at 930, 950, 970, 990 and 1010 ℃ and tensile properties, impact properties tempered at 460 ℃ were investigated. The results show that there is decreasing ferrite content in the core area of all the quenched microstructure when the temperature increases from 930 ℃ to 1010 ℃, and the quenched Vickers hardness is fluctuated from depth of 6 mm to the core due to the non-uniformity of the microstructure. The 1010 ℃ quenched Vickers hardness from edge to 1/2 radius is the highest, which shows the higher quenching temperature is good for austenite homogenization. There is no change of tensile properties quenched at 930-1010 ℃ and tempered at 460 ℃, and the best impact properties can be obtained when quenched at 1010 ℃ and tempered at 460 ℃. When the quenching temperature is 1010 ℃, 35Si2Cr steel has better comprehensive mechanical properties.

Key words: 35Si2Cr steel, ferrite, quenching temperature, impact properties

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