弛豫时间对薄规格450 MPa级高强钢微观组织和性能的影响

韩楚菲; 董毅; 时晓光; 孙成钱; 王俊雄; 李智; 徐海健

doi:10.7513/j.issn.1004-7638.2025.06.023

弛豫时间对薄规格450 MPa级高强钢微观组织和性能的影响

doi: 10.7513/j.issn.1004-7638.2025.06.023

韩楚菲^{1, 2, 3,},
董毅^{1, 2},
时晓光^{1, 2},
孙成钱^{1, 2},
王俊雄^{1, 2},
李智^{1, 2},
徐海健^1, ,

1.
鞍钢股份有限公司, 辽宁鞍山 114009
2.
海洋装备金属材料及其应用全国重点试验室, 辽宁鞍山 114021
3.
沈阳工业大学, 辽宁沈阳 110023

详细信息

作者简介:
韩楚菲，1991年出生，女，高级工程师，从事先进钢铁结构材料的研究，E-mail: chufeihan@ansteel.com.cn

通讯作者:
徐海健，1987年出生，男，正高级工程师，从事先进钢铁结构材料的研究， E-mail：haijianxu2013@163.com

中图分类号: TF76,TG142
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- 文章访问数: 26
- HTML全文浏览量: 12
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2025-08-06
- 录用日期: 2025-09-09
- 修回日期: 2025-08-25
- 网络出版日期: 2025-12-31
- 刊出日期: 2025-12-31

The influence of relaxation time on the microstructure and properties of thin-gauge 450 MPa grade high-strength steel

HAN Chufei^{1, 2, 3
,},
DONG Yi^{1, 2},
SHI Xiaoguang^{1, 2},
SUN Chengqian^{1, 2},
WANG Junxiong^{1, 2},
LI Zhi^{1, 2},
XU Haijian^{1
, ,}

1.
Anshan Iron & Steel Co., Ltd., Anshan 114009, Liaoning, China
2.
State Key Laboratory of Metallic Materials for Marine Equipment and Applications, Anshan 114021, Liaoning, China
3.
Shenyang University of Technology, Shengyang 110023, Liaoning, China

摘要

摘要: 采用室温拉伸、-20 ℃时CVN冲击、-15 ℃时DWTT落锤撕裂试验等力学性能测试方法和光学显微镜（OM）、扫描电镜（SEM）、透射电镜（TEM）等显微组织分析手段，研究了轧后驰豫时间0、30、60、75 s对薄规格450 MPa级高强钢微观组织和力学性能的影响。试验结果表明，随着弛豫时间延长，多边形铁素体（PF）尺寸逐渐长大、比例逐渐增加，晶粒内部富Nb、Ti纳米碳氮化物析出量呈现先增加后减少的趋势，屈服强度、抗拉强度、断后伸长率和-20 ℃下的冲击功和-15 ℃的DWTT呈现先升高后降低的趋势，屈强比先降低后升高，驰豫时间为60ｓ时能够获得较高的强韧性和低屈强比，可满足工程结构用钢的技术要求。
- 析出相 /
- 高强钢 /
- 屈强比 /
- 驰豫 /
- 晶粒尺寸
Abstract: In this research, the effects of relaxation times varying from 0 s to 75 s after rolling on the microstructure and mechanical properties of thin-gauge 450 MPa grade high-strength steel were studied. The room temperature tensile performance, CVN impact energy at -20 ℃ and DWTT drop hammer test at -15 ℃were performed. The microstructure and precipitates evolution of 450 MPa grade obtained with different relaxation times were observed by using optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental results showed that with the prolongation of relaxation time, the grain size and ratio of PF increased, the volume fraction of Nb/Ti-rich nano carbonitride precipitation firstly increased and decreased, the yield, tensile strength, fracture elongation, -20 ℃ CVN impact energy and -15 ℃ DWTT properties also showed similar trend. While the yield ratio decreased firstly, and then increased. When the relaxation time was 60 s, the higher strength and toughness and the lower yield ration were achieved, those could meet the technical requirements for steel used in engineering structures.
- precipitates /
- high-strength steel /
- YS-UTS ratio /
- relaxation /
- grain size

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图 1 钢板控轧和控冷工艺示意

Figure 1. Sketch diagrarm of controlled rolling and cooling used in this experiment

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图 2 不同驰豫时间下450 MPa级微合金钢金相组织

Figure 2. Metallographic structure of 450 MPa grade microalloyed steel obtained under different relaxation times

(a) 0 s; (b) 30 s; (c) 60 s; (d) 75 s

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图 3 不同驰豫时间下450 MPa级微合金钢SEM形貌

Figure 3. SEM morphologies of 450 MPa grade microalloyed steel obtained under different relaxation times

(a) 0 s; (b) 30 s; (c) 60 s; (d) 75 s

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图 4 不同驰豫时间下450 MPa级微合金钢析出相形貌

Figure 4. Morphology of precipitates in 450 MPa grade microalloyed steels obtained under different relaxation times

(a) 0 s; (b) 30 s; (c) 60 s; (d) 75 s

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图 5 不同驰豫时间下450 MPa级微合金钢析出相尺寸分布

Figure 5. Diameter distribution of precipitates in 450 MPa grade microalloyed steels obtained under different relaxation times

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图 6 试验钢中不同尺寸析出相的EDS能谱

(a) 富Nb碳氮化物; (b) 富Ti的碳氮化物

Figure 6. EDS energy spectrum of precipitated phases of different sizes in test steel

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表 1 450 MPa级微合金钢化学成分

Table 1. Chemical composition of 450 MPa grade microalloyed steel %

C	Si	Mn	P	S	Cr	Ti	Nb	N
0.06~0.08	0.12~0.3	1.55~1.7	≤0.015	≤0.010	0.07~0.13	0.001~0.0015	0.03~0.05	≤0.010

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表 2 不同驰豫时间下450 MPa级微合金钢力学性能对比

Table 2. Comparison of mechanical properties of 460 MPa grade microalloyed steels obtained under different relaxation times

Relaxation time/s	R_p0.2/MPa	R_m/MPa	-20 ℃ A_kv2/J	-10 ℃ DWTT/%	Elongation/%	Yield ratio
0	455	562	199	85	21.2	0.81
30	467	591	231	90	23.6	0.79
60	481	622	262	98	25.1	0.77
75	445	551	211	70	20.1	0.81
Technical agreement	450～ 530	535～ 635	≥150	≥85	≥18	≤0.90

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