轧后调质处理对热轧Q345R钢中元素偏析与带状组织的调控作用

杨艳; 汪贺模; 高擎; 彭飞; 张开铭; 袁武华

doi:10.7513/j.issn.1004-7638.2025.06.022

轧后调质处理对热轧Q345R钢中元素偏析与带状组织的调控作用

doi: 10.7513/j.issn.1004-7638.2025.06.022

杨艳^1,,
汪贺模¹,
高擎¹,
彭飞²,
张开铭²,
袁武华^2, ,

1.
湖南华菱湘潭钢铁有限公司, 湖南湘潭 411101
2.
湖南大学材料科学与工程学院, 湖南长沙410082

详细信息

作者简介:
杨艳，1981年出生，女，陕西富平人，本科，高级工程师，主要从事板材热处理相关工艺技术研究，E-mail：Yy9958@163.com

通讯作者:
袁武华，1973年出生，男，湖南长沙人，博士，教授，主要从事金属材料制备与应用技术研究，E-mail：yuan46302@163.com

中图分类号: TF125.1,TG156
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- 文章访问数: 28
- HTML全文浏览量: 14
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2025-05-09
- 录用日期: 2025-06-19
- 修回日期: 2025-06-11
- 网络出版日期: 2025-12-31
- 刊出日期: 2025-12-31

Regulation effect of post-rolling quenching and tempering treatment on element segregation and banded microstructure in hot-rolled Q345R steel

1.
Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan 411101, Hunan, China
2.
School of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan, China

摘要

摘要: 深入探究了轧后调质处理（890 ℃淬火+710 ℃回火）对热轧Q345R钢中元素偏析及其引发的带状组织的调控作用与机制。结果表明：热轧Q345R钢由再结晶铁素体和珠光体组成，珠光体呈带状分布，铁素体晶界及晶内的珠光体呈颗粒状分布；经过轧后调质处理的Q345R钢基体组织为回火马氏体，且内部存在少量再结晶马氏体，回火马氏体中富C富Mn区域存在渗碳体密集析出带。热轧和轧后调质处理Q345R钢中均存在显著的C、Mn元素偏析，且带状组织（珠光体带或渗碳体析出带）均与元素偏析带高度重合。轧后调质处理虽未消除凝固遗留的元素偏析，但通过马氏体相变有效打破了固态相变对原始元素分布的高度依赖性，显著调控了带状组织的形成模式与特征，并将带状组织等级从5B降低至3B；同时，将软硬相强度差值从206.76 MPa调控降低至119.48 MPa，有效改善了因带状组织导致的力学性能不均匀性。
- Q345R钢 /
- 带状组织 /
- 调质处理 /
- 元素偏析 /
- 回火马氏体
Abstract: The regulation effect and mechanism of quenching and tempering treatment after rolling (890 ℃ quenching + 710 ℃ tempering) on element segregation and the resultant banded microstructure in hot-rolled Q345R steel were thoroughly investigated. The results show that the microstructure of the hot-rolled Q345R steel consists of recrystallized ferrite and pearlite. The pearlite is distributed in bands and granular pearlite presents at the ferrite grain boundaries and within ferrite grain. The matrix microstructure of Q345R steel prepared by quenching and tempering treatment is tempered martensite containing a small amount of recrystallized martensite, with dense cementite precipitation bands observed in C- and Mn-rich regions of the tempered martensite. Critically, significant C and Mn segregation exists in both hot-rolled and quenched & tempered Q345R steel, and the banded microstructure (pearlite bands or cementite precipitation bands) highly coincides with the segregation bands. Although quenching and tempering after rolling does not eliminate the solidification-inherited element segregation, it effectively regulates the formation mode and characteristics of the banded structure by disrupting the high dependence of solid-state phase transformation on the original elemental distribution via martensitic transformation, reducing the banding severity from grade 5B to 3B. Concurrently, it reduces the strength difference between soft and hard phases from 206.76 MPa to 119.48 MPa, thereby ameliorating the mechanical property inhomogeneity induced by the banded microstructure.
- Q345R steel /
- banded microstructure /
- quenching and tempering treatment /
- element segregation /
- tempered martensite

HTML全文

图 1 Q345R钢的典型OM组织

(a)(b)热轧工艺；(c)(d)调质处理工艺

Figure 1. Typical OM microstructure of Q345R steel

下载: 全尺寸图片幻灯片

图 2 Q345R钢的带状组织等级评定

(a)热轧工艺；(b)调质处理工艺

Figure 2. Band structure grading of Q345R steel

下载: 全尺寸图片幻灯片

图 3 Q345R钢的典型SEM形貌特征

(a)(b)热轧工艺；(c)(d)调质处理工艺

Figure 3. Typical SEM morphological characteristics of Q345R steel

下载: 全尺寸图片幻灯片

图 4 Q345R钢的波谱线扫结果

(a)热轧工艺；(b)调质处理工艺

Figure 4. Wavelength dispersive spectrometer(WDS) line-scanning results of Q345R steel

下载: 全尺寸图片幻灯片

图 5 Q345R钢热轧工艺和调质处理工艺的EBSD结果

（a）（b） BC值及晶界分布；（c）（d）取向分布；（e）（f）微取向差分布

Figure 5. EBSD results of Q345R steel

下载: 全尺寸图片幻灯片

表 1 试验钢化学成分

Table 1. Chemical composition of the tested steel %

C	Si	Mn	P	S	Cr
0.16	0.35	1.52	0.005	0.002	0.28

下载: 导出CSV

表 2 不同工艺下Q345R钢中各相的维氏显微硬度值

Table 2. Vickers micro-hardness values of each phase in Q345R steel under different processes

Process type	Detection position	Hardness（HV）	Conversion strength/MPa	Difference in hardness and softness strength/MPa
Hot rolling process	Ferrite + Grain boundary pearlite	138.49	443.96	206.76
Hot rolling process	Pearlite band	204.26	650.72	206.76
Tempering process	Tempered martensitic matrix	160.70	512.33	119.48
Tempering process	Carbide precipitation band	199.15	631.81	119.48

下载: 导出CSV

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