锻造温度与正火制度对SCr415H钢混晶缺陷和硬度的影响

doi:10.13251/j.issn.0254-6051.2023.08.013

金属热处理 ›› 2023, Vol. 48 ›› Issue (8): 80-86.DOI: 10.13251/j.issn.0254-6051.2023.08.013

锻造温度与正火制度对SCr415H钢混晶缺陷和硬度的影响

刘阳, 亓海全, 韩向楠, 李天然, 薛启河, 王为民, 刘安奇, 郭春成

桂林理工大学材料科学与工程学院, 广西桂林 541000

收稿日期:2023-03-06 修回日期:2023-07-02 出版日期:2023-08-25 发布日期:2023-10-10
通讯作者: 亓海全,副教授,硕士生导师,E-mail: alexander_qi@163.com
作者简介:刘阳(1997—),男,硕士研究生,主要研究方向为金属材料及其热处理工艺,E-mail: 1241870284@qq.com。

Effects of forging temperature and normalizing scheme on mixed crystal defects and hardness of SCr415H steel

Liu Yang, Qi Haiquan, Han Xiangnan, Li Tianran, Xue Qihe, Wang Weimin, Liu Anqi, Guo Chuncheng

School of Materials Science and Engineering, Guilin University of Technology, Guilin Guangxi 541000

Received:2023-03-06 Revised:2023-07-02 Online:2023-08-25 Published:2023-10-10

摘要/Abstract

摘要： 针对SCr415H低合金钢锻造生产的环形零件进行连续正火处理时出现了硬度偏低和混晶缺陷,以1150、1200和1230 ℃锻造温度下的实物作为试料,自试料截取试样作常规正火和两段式冷却正火,常规正火加热温度为870、900、950和1000 ℃及保温时间90 min,在两段式正火加热温度950、1000和1050 ℃保温60 min后取出试样,转移至预热至870 ℃和900 ℃的箱式炉继续保温30 min 后空冷。结果表明,针对SCr415H钢在实际生产中出现的硬度偏低和混晶缺陷,常规正火可采用锻造温度1200 ℃,正火加热温度900 ℃的热加工规范;两段式正火工艺参数为锻造温度1200 ℃,第一段加热温度1000 ℃,第二段加热温度870~900 ℃。考虑到生产效率、炉体寿命等生产实际,优选热加工工艺为锻造温度1200 ℃,正火温度900 ℃,由此,研究结果对于指导SCr415H钢的锻造、热处理生产有重要的实用意义。

关键词: SCr415H钢, 锻造, 正火, 混晶, 硬度

Abstract: During continuous normalizing treatment of circular parts produced by forged SCr415H low-alloy steel, there were low hardness and mixed crystal defects. The physical objects forged at temperatures of 1150, 1200, and 1230 ℃ were used as tested materials, and specimens were cut from the tested materials for conventionally normalizing and normalizing with two-stage cooling. The normalizing heating temperatures were 870, 900, 950, and 1000 ℃, and the holding time was 90 min. After two-stage normalizing at temperatures of 950, 1000, and 1050 ℃ for 60 min, the specimens were taken out and transferred in a box furnace preheated to 870 ℃ and 900 ℃ for further holding for 30 min then air cooled. The results show that in view of the low hardness and mixed crystal defects of the SCr415H steel in actual production, hot working specifications with forging temperature of 1200 ℃ and normalizing heating temperature of 900 ℃ can be used for normal normalizing; the two-stage normalizing process parameters are forging temperature of 1200 ℃, first heating temperature of 1000 ℃, and second heating temperature of 870-900 ℃. Taking into account the production efficiency, furnace life and other production practices, the preferred hot working process is forging temperature of 1200 ℃, normalizing temperature of 900 ℃. Thus, the results of the study have important practical significance for guiding the forging and heat treatment production of SCr415H steel.

Key words: SCr415H steel, forging, normalizing, mixed crystal, hardness

中图分类号:

TG156.4

刘阳, 亓海全, 韩向楠, 李天然, 薛启河, 王为民, 刘安奇, 郭春成. 锻造温度与正火制度对SCr415H钢混晶缺陷和硬度的影响[J]. 金属热处理, 2023, 48(8): 80-86.

Liu Yang, Qi Haiquan, Han Xiangnan, Li Tianran, Xue Qihe, Wang Weimin, Liu Anqi, Guo Chuncheng. Effects of forging temperature and normalizing scheme on mixed crystal defects and hardness of SCr415H steel[J]. Heat Treatment of Metals, 2023, 48(8): 80-86.

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锻造温度与正火制度对SCr415H钢混晶缺陷和硬度的影响

Effects of forging temperature and normalizing scheme on mixed crystal defects and hardness of SCr415H steel

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