热处理工艺对2.0 GPa级冷轧热成形钢组织性能的影响

薛仁杰; 曹晓恩; 赵林林; 刘鹏; 高云哲

doi:10.7513/j.issn.1004-7638.2023.02.024

热处理工艺对2.0 GPa级冷轧热成形钢组织性能的影响

doi: 10.7513/j.issn.1004-7638.2023.02.024

1.
河钢集团钢研总院, 河北石家庄 050000
2.
河钢集团邯钢公司技术中心, 河北邯郸 056015

详细信息

作者简介:
薛仁杰，1987年出生，男，工程师，硕士，主要从事汽车板产品开发及应用技术研究，E-mail：jierenxue@126.com

通讯作者:
刘鹏，1989年出生，男，工程师，硕士，主要从事冷轧高强钢产品开发及应用技术研究，E-mail：liupeng@hbisco.com

中图分类号: TF76,TG156
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出版历程
- 收稿日期: 2022-08-11
- 刊出日期: 2023-04-30

Effect of heat treatment process on the microstructure and properties of a 2.0 GPa cold-rolled hot-formed steel

1.
Technology Research Institute, HBIS Group, Shijiazhuang 050000, Hebei, China
2.
Technology Center, Handan Company, HBIS Group, Handan 056015, Hebei, China

摘要

摘要: 采用光学显微镜（OM）、扫描电镜（SEM）、电子探针（EPMA）等方法，对不同热处理温度下2.0 GPa级热成形钢显微组织与力学性能进行表征与分析。结果表明：随着奥氏体化温度的提高，屈服强度和抗拉强度呈现上升趋势，而断后伸长率呈现先升高后下降的趋势。经过890 ℃保温370 s，以100 ℃/s冷速淬火至室温，可获得抗拉强度2025 MPa，断后伸长率10.2 %，强塑积达到20.66 GPa%的良好性能。随着奥氏体化温度提高，可降低C、Mn元素偏析程度，改善马氏体带状组织，避免马氏体带状组织引起不协调变形，延缓产生裂纹源与提高材料塑性。
- 热成形钢 /
- 奥氏体化温度 /
- 显微组织 /
- 强塑性 /
- 元素富集
Abstract: Optical microscope (OM), scanning electron microscope (SEM) and electron probe (EPMA) were used to characterize and analyze the microstructure and mechanical properties of a 2.0 GPa hot-formed steel heat-treated by different heat treatment temperature. The results show that the yield strength and tensile strength increased with the increase in austenitizing temperature, while the elongation after fracture increased to a maximum and then decreased. After holding at 890 ℃ for 370 s, and quenching to room temperature at a cooling rate of 100 ℃/s, a steel with the tensile strength of 2025 MPa, the 10.2% elongation after fracture and the 20.66 GPa% strength-plastic product can be obtained. As the austenitization temperature increases, the segregation degree of C and Mn elements can be reduced, and the martensite band structure can be improved. In the meanwhile, the uncoordinated deformation caused by the martensite band structure can be avoided, and thus the occurrence of crack sources can be delayed, as well as the plasticity can be improved.
- hot-formed steel /
- austenitizing temperature /
- microstructure /
- strength plasticity /
- element enrichment

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图 2 不同热处理工艺下钢的原始奥氏体形貌（OM）

Figure 2. Prior austenite morphology (OM) under different heat treatment processes

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图 1 2 GPa基料组织

Figure 1. Microstructures of the 2 GPa base material

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图 3 不同热处理工艺下钢的显微组织（OM）

Figure 3. Microstructures of specimens under different heat treatment processes(OM)

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图 4 不同热处理工艺下钢的显微组织（SEM）

Figure 4. Microstructures of specimens under different heat treatment processes(SEM)

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图 5 不同热处理后试验钢中C、Mn元素分布的EPMA像

(a)～(c）奥氏体化温度870 ℃/890 ℃/910 ℃下C元素分布；(d)～(f）奥氏体化温度870 ℃/890 ℃/910 ℃下Mn元素分布

Figure 5. EPMA images of C and Mn elements distributions of the tested steel after different heat treatment processes

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图 6 工程应力-应变曲线

Figure 6. Engineering stress-strain curve

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图 7 加工硬化率-真应变曲线

Figure 7. Work-hardening rate-true strain curve

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图 8 不同热处理工艺拉伸断口形貌（SEM）

Figure 8. Fractography under different heat treatment processes (SEM)

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表 1 试验钢主要成分

Table 1. Composition of the hot-formed steel %

C Si Mn P S Cr B Al V&Nb

0.3～0.5 0.3～0.6 1.4～2.0 ≤0.020 ≤0.010 0.2～0.5 0.002～0.005 0.03～0.005 0.1～0.3

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表 2 不同热处理工艺下试验钢力学性能

Table 2. Mechanical properties of the experimental steel under different heat treatment processes

序号 R_eL/MPa R_m/MPa A/% 强塑积/(GPa%)

工艺Ⅰ 1091.3 1930.6 5.4 10.43
工艺Ⅱ 1491.6 2025.0 10.2 20.66
工艺Ⅲ 1515.3 2043.9 8.4 17.17

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