金属热处理 ›› 2022, Vol. 47 ›› Issue (6): 123-127.DOI: 10.13251/j.issn.0254-6051.2022.06.024

• 工艺研究 • 上一篇    下一篇

模拟正火温度对Q355E钢锻件组织和性能的影响

何春静1,2,3, 庞庆海1,3, 李洁1,2, 殷立涛1,2,3, 聂新林1   

  1. 1.洛阳中重铸锻有限责任公司, 河南 洛阳 471039;
    2.矿山重型装备国家重点实验室, 河南 洛阳 471039;
    3.洛阳市大型铸锻件材料企业研发中心, 河南 洛阳 471039
  • 收稿日期:2022-02-01 修回日期:2022-04-05 出版日期:2022-06-25 发布日期:2022-07-05
  • 作者简介:何春静(1995—),女,助理工程师,硕士,主要研究方向为金属材料组织及性能,E-mail:he1399100328@163.com
  • 基金资助:
    国家重点研发计划(2020YFB2008400)

Effect of simulated normalizing temperature on microstructure and properties of Q355E steel forgings

He Chunjing1,2,3, Pang Qinghai1,3, Li Jie1,2, Yin Litao1,2,3, Nie Xinlin1   

  1. 1. Luoyang CITIC HIC Casting & Forging Co., Ltd., Luoyang Henan 471039, China;
    2. State Key Laboratory of Mining Heavy Equipment, Luoyang Henan 471039, China;
    3. Luoyang Large Casting and Forging Material Enterprise Research and Development Center, Luoyang Henan 471039, China
  • Received:2022-02-01 Revised:2022-04-05 Online:2022-06-25 Published:2022-07-05

摘要: 利用模拟程控热处理炉进行300 mm×300 mm截面Q355E钢锻件心部材料的模拟正火处理试验,通过光学显微镜、扫描电镜、拉伸和冲击试验机,研究模拟正火温度对厚截面风电法兰用Q355E钢锻件组织和性能的影响。结果表明,模拟正火温度由780 ℃升高至900 ℃,并经580 ℃回火后,材料-50 ℃冲击吸收能量呈现先增加后降低的趋势,铁素体平均尺寸由14.73 μm降低至12.07 μm又增大至15.02 μm,珠光体的平均尺寸从3.69 μm增大至10.51 μm;模拟正火温度为820 ℃和840 ℃时,铁素体和珠光体组织均匀细小,珠光体呈条状和近等轴状分布,-50 ℃冲击吸收能量为183.8~211.1 J,试样剪切断面率在50%以上。对于300 mm×300 mm截面Q355E钢锻件,可选择820~840 ℃正火处理,以获得优良稳定的低温冲击吸收能量。

关键词: Q355E钢, 模拟正火处理, 低温韧性, 显微组织, 厚截面锻件

Abstract: Simulated normalizing treatment of the center material of a 300 mm×300 mm section Q355E steel forging was carried out by using a simulated program-controlled heat treatment furnace. Effect of simulated normalizing temperature on the microstructure and properties of Q355E steel forgms for thick section wind-electron flange was studied by optical microscope, scanning electron microscope, tensile and impact testing machines. The results show that with the increase of simulated normalizing temperature in range of 780-900 ℃ and then tempered at 580 ℃, the impact absorbed energy at -50 ℃ of the specimens increases first and then decreases, and the average size of ferrite decreases from 14.73 μm to 12.07 μm and then increases to 15.02 μm, and the average size of pearlite increases from 3.69 μm to 10.51 μm. When the simulated heat treatment temperature is 820 ℃ and 840 ℃, the microstructure of ferrite and pearlite is uniform and fine, and pearlite is distributed in strip and near equiaxed shape, the impact absorbed energy at -50 ℃ is 183.8 J to 211.1 J, and the shear section ratio of the specimens is more than 50%. For 300 mm×300 mm section Q355E steel forgings, normalizing treatment at 820-840 ℃ can be selected to obtain excellent and stable low temperature impact absorbed energy.

Key words: Q355E steel, simulated normalizing treatment, low temperature toughness, microstructure, large section forgings

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