高铝增强成形性双相钢980DH组织性能研究

周莉; 薛仁杰; 曹晓恩; 董梦瑶

doi:10.7513/j.issn.1004-7638.2022.02.028

高铝增强成形性双相钢980DH组织性能研究

doi: 10.7513/j.issn.1004-7638.2022.02.028

1.
重庆工业职业技术学院机械工程与自动化学院, 重庆 401120
2.
河钢集团钢研总院, 河北石家庄 050000
3.
河钢集团邯钢公司技术中心, 河北邯郸 056015

基金项目: 重庆市教委科学技术研究项目（编号：KJ1730416）。

详细信息

作者简介:
周莉（1989—），女，讲师，硕士，主要从事金属材料研究，E-mail：zhouli89@yeah.net

通讯作者:
曹晓恩（1986—），男，高级工程师，博士，主要从事汽车板产品研发及材料成型工艺研究，E-mail：caoxiaoen1986@163.com

中图分类号: TF76,TG142.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-23
- 网络出版日期: 2022-05-11
- 刊出日期: 2022-04-28

Study on microstructure and properties of high aluminum dual phase steel 980DH with high formability

1.
School of Mechanical Engineering and Automation, Chongqing Industry Polytechnic College, Chongqing 401120, China
2.
Technology Research Institute, HBIS Group, Shijiazhuang 050000, Hebei, China
3.
Technology Center, Handan Company, HBIS Group, Handan 056015, Hebei, China

摘要

摘要: 采用相变淬火膨胀仪、连退热模拟试验机等开展高铝增强成形性双相钢980DH静态连续冷却转变、连续退火工艺对冷轧板组织、性能的影响规律研究。结果显示：冷却速率在5～10 ℃/s，只发生贝氏体相变；当冷速＞15 ℃/s后，随着冷速的提高,贝氏体占比减少,马氏体含量增加；980DH钢基体组织主要为铁素体、马氏体和残余奥氏体；均热温度（780～800 ℃）×160 s、缓冷温度650～700 ℃、冷却速率50 ℃/s快冷至300 ℃，保温5 min时效处理后空冷至室温，可获得性能优异的CR550/980DH。研究结果对工业开发高级别DH钢具有指导意义。
- 双相钢 /
- 980DH /
- 静态CCT /
- 显微组织 /
- 性能 /
- 残余奥氏体
Abstract: The influence of static continuous cooling transformation and continuous annealing process on the structure and properties of cold-rolled plates for high aluminum dual phase steel 980DH with high formability were studied by phase transformation quenching dilatometer, continuous annealing simulation tester. The results show that when the cooling rate is between 5 °C/s and 10 °C/s, only bainite transformation occurs. When the cooling rate is greater than 15 °C/s, the proportion of bainite decreases and the fraction of martensite increases as the cooling rate increases. The microstructure of 980DH steel contain mainly ferrite, martensite and retained austenite. Under the processing conditions of soaking temperature at (780～800 ℃)×160 s, slow cooling temperature at 650～700 ℃, cooling rate at 50 ℃/s to 300 ℃ aging treatment for 5 minutes, and then air-cooled to room temperature, CR550/980DH steel plates can achieve excellent performance. It is hoped that this research can be beneficial to the industrial development of high-grade DH steel.
- dual phase steel /
- 980DH /
- static CCT curve /
- microstructure /
- property /
- retained austenite

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图 1 静态连续冷却工艺示意

Figure 1. Schematic diagram of static continuous cooling process

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图 2 温度-膨胀量曲线

Figure 2. Curve of temperature-expansion of tested steel

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图 3 静态CCT曲线

Figure 3. Static CCT curve of tested steel

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图 4 不同冷速条件下显微组织

Figure 4. Microstructure of steel cooled down at different cooling rates

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图 5 连退热模拟试验钢显微组织

(a)方案1；(b)方案2；(c)方案3；(d)方案4；(e)方案5；(f)方案6

Figure 5. Microstructure of steel after continuous annealing simulation experiment

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图 6 方案5试验钢的EBSD形貌

Figure 6. EBSD morphology of experimental steel in scheme 5

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表 1 试验钢980DH主要化学成分

Table 1. Main chemical compositions of experimental steel 980DH %

C	Si	Mn	P	S	Als	Nb	Ti	Cr	Mo
0.12	0.40	2.0	0.012	0.008	0.55	0.025	0.015	0.25	0.20

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表 2 试验方案及力学性能

Table 2. Experimental scheme and mechanical properties

方案	均热温度/℃	缓冷温度/℃	快冷温度/℃	R_p0.2/MPa	R_m/MPa	A/%
1	820	700	300	606	1062	14.51
2	800	700	300	561	1034	16.41
3	780	700	300	638	1075	16.45
4	800	680	300	581.7	1027.5	16.03
5	800	650	300	579.7	1038.8	16.41
6	800	720	300	604	1046.5	14.96

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