回火温度对淬火后1500 MPa级热成形钢力学性能和组织的影响

王子健; 黄伟; 彭则; 梁肖; 邓建林

doi:10.7513/j.issn.1004-7638.2024.06.023

回火温度对淬火后1500 MPa级热成形钢力学性能和组织的影响

doi: 10.7513/j.issn.1004-7638.2024.06.023

王子健^{1, 2,},
黄伟^1, ,,
彭则¹,
梁肖¹,
邓建林¹

1.
江西豪斯特汽车零部件有限公司, 江西九江 332400
2.
苏州大学, 江苏苏州 215031

基金项目: 国家自然科学基金青年基金项目(51905189)；国家科技重大专项项目(2018ZX04023001)。

详细信息

作者简介:
王子健，1989年出生，男，湖北荆州人，博士，主要研究方向：高强钢热冲压成形工艺，E-mail:wangzijian@suda.edu.cn

通讯作者:
黄伟，1998年出生，男，江西南昌人，硕士研究生，主要研究方向：钢铁材料组织性能优化，E-mail:707708810@qq.com

中图分类号: TF76,TG156
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- 被引次数: 0
出版历程
- 收稿日期: 2023-12-26
- 网络出版日期: 2024-12-30
- 刊出日期: 2024-12-30

Effect of tempering temperature on the mechanical properties and microstructures of 1500 MPa hot stamping steel after quenching

Wang Zijian^{1, 2
,},
Huang Wei^{1
, ,},
Peng Ze¹,
Liang Xiao¹,
Deng Jianlin¹

1.
Jiangxi Hot Stamping Automotive Component Co., Ltd., Jiujiang 332400, Jiangxi, China
2.
Sochoow University, Suzhou 215031, Jiangsu, China

摘要

摘要: 针对1 500 MPa级热成形钢进行淬火和回火处理，利用金相显微镜、室温拉伸检测和扫描电镜等方法研究回火温度对材料显微组织和力学性能的影响。结果表明：Cr含量过高，会降低C的活度，抑制渗碳体的形成，因此钢中主要碳化物为M23C6和M7C3类，随着回火温度提高到400 ℃左右，碳化物会由M23C6类转化为M7C3类；抗拉强度、屈服强度和硬度随着回火温度的升高逐渐降低，当回火温度超过400 ℃之后强度会显著降低，延伸率随着回火温度的升高逐渐升高，而强塑积随着回火温度的升高呈现先增大后减小的趋势；板条马氏体中存在的高密度位错会随着回火温度的升高而下降，马氏体板条会相互吞噬、合并，逐渐模糊，基体中出现铁素体，此外碳化物也会析出并长大。
- 1 500 MPa级热成形钢 /
- 回火 /
- 碳化物 /
- 马氏体板条
Abstract: Quenching and tempering treatment were carried out on a 1 500 MPa hot formed steel, and the effects of tempering temperature on the microstructures and mechanical properties were studied using methods such as metallographic microscopy, room temperature tensile testing, and scanning electron microscopy. The results show that if the Cr content is too high, it will reduce the activity of C and inhibit the formation of carbides. Therefore, the main carbides in the steel are M23C6 and M7C3. As the tempering temperature increases to around 400 ℃, the carbides will transform from M23C6 to M7C3, and the tensile strength, yield strength, and hardness will gradually decrease with the increase of tempering temperature. When the tempering temperature exceeds 400 ℃, the strength will significantly decrease, the elongation will gradually increase by enhancing tempering temperatures. The strength plastic product will first increase and then decrease with the increase of tempering temperature. The high-density dislocations in Flat noodles martensite will decrease, and the martensite will engulf and merge with each other, and then gradually blur with the increase of tempering temperature. Ferrites appear in the matrix. In addition, carbides will also precipitate and grow up.
- 1 500 MPa hot stamping steel /
- tempering /
- carbides /
- martensitic flat noodles

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图 1 拉伸试样尺寸（单位：mm）

Figure 1. Dimensions of tensile specimens

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图 2 试验钢平衡相图

Figure 2. Equilibrium phase diagram of the experimental steel

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图 3 试样回火后力学性能

(a)抗拉强度、屈服强度和延伸率；(b)硬度和强塑积

Figure 3. Mechanical properties of the samples after tempering

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图 4 淬火后金相组织形貌

Figure 4. Metallographic diagram after quenching

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图 5 淬火后SEM形貌

Figure 5. SEM image after quenching

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图 6 不同回火温度金相图

Figure 6. Metallographic diagrams of different tempering temperatures

(a)200 ℃；(b)300 ℃；(c)400 ℃；(d)500 ℃

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图 7 不同回火温度SEM形貌

Figure 7. SEM images of different tempering temperatures

(a)200 ℃；(b)300 ℃；(c)400 ℃；(d)500 ℃

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图 8 不同回火温度下碳化物尺寸

Figure 8. Carbide sizes at different tempering temperatures

(a)200 ℃；(b)300 ℃；(c)400 ℃；(d)500 ℃

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