金属热处理 ›› 2026, Vol. 51 ›› Issue (1): 264-268.DOI: 10.13251/j.issn.0254-6051.2026.01.040

• 工艺研究 • 上一篇    下一篇

热处理工艺参数、试样尺寸及合金元素对等温淬火球墨铸铁力学性能的影响

杨宝清, 胡昭南, 邓春燕, 王力, 唐治恒, 安康, 汪虹   

  1. 重庆齿轮箱有限责任公司, 重庆 402263
  • 收稿日期:2025-07-21 修回日期:2025-10-27 出版日期:2026-01-25 发布日期:2026-01-27
  • 作者简介:杨宝清(1992—),男,工程师,硕士,主要从事材料加工及材料改性方面的工作,E-mail:18293189352@163.com

Effect of heat treatment parameters, specimen dimensions and alloying elements on mechanical properties of austempered ductile iron

Yang Baoqing, Hu Zhaonan, Deng Chunyan, Wang Li, Tang Zhiheng, An Kang, Wang Hong   

  1. Chongqing Gearbox Co., Ltd., Chongqing 402263, China
  • Received:2025-07-21 Revised:2025-10-27 Online:2026-01-25 Published:2026-01-27

摘要: 选取不同尺寸的QT700-2A球墨铸铁及合金球墨铸铁试样,对其进行奥氏体化(865、905 ℃)+等温淬火(300 ℃)+回火(280、320 ℃)处理,研究了热处理工艺参数、试样尺寸和合金元素对等温淬火球墨铸铁(ADI)性能的影响。结果表明,采用较低的奥氏体化温度可在提高ADI强度的同时使塑性略有提升,而较高的奥氏体化温度虽可使强度进一步提高,但同时使塑性降低。回火温度略高于等温淬火温度时,ADI在保持屈服强度的同时,塑韧性增强。随厚度增加,ADI抗拉强度、屈服强度和屈强比逐渐降低,塑性提高。增加合金元素不能有效提高ADI的强度和塑性,反而会增加材料成本。

关键词: 等温淬火球墨铸铁, 奥氏体化温度, 回火温度, 合金元素, 试样尺寸, 力学性能

Abstract: QT 700-2A ductile iron and alloy ductile iron specimens with different dimensions were selected and subjected to auetenitization (865, 905 ℃)+austempering (300 ℃)+tempering (280, 320 ℃) treatments. Effects of heat treatment parameters, specimen dimensions and alloying elements on the properties of austempered ductile iron (ADI) were investigated. The results indicate that lower austenitizing temperature enhances the strength of the ADI while slightly improving its plasticity. Higher austenitizing temperature further increases the strength but reduces the plasticity. When the tempering temperature is slightly higher than the austempering temperature, the plasticity and toughness are enhanced while the yield strength is maintained. As the wall thickness increases, the tensile strength, yield strength, and yield-strength ratio of the ADI gradually decrease, while the plasticity increases. Adding alloying elements cannot effectively improve the strength and plasticity of the ADI and may instead increase the material cost.

Key words: austempered ductile iron (ADI), austenitizing temperature, tempering temperature, alloying element, specimen dimension, mechanical properties

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