钛微合金化对22MnB5汽车用钢组织及性能的影响

王功; 季国顺

doi:10.7513/j.issn.1004-7638.2021.01.025

钛微合金化对22MnB5汽车用钢组织及性能的影响

doi: 10.7513/j.issn.1004-7638.2021.01.025

王功^1,,
季国顺²

1.
江海职业技术学院机电汽车学院，江苏扬州 225101
2.
杭州电子科技大学机械工程学院，浙江杭州 310018

基金项目: 国家自然科学基金（51405119）；江苏省机电重点专业建设支持项目（JS2017016）。

详细信息

作者简介:
王功（1969—），男，江苏高邮人，汉族，硕士，副教授，主要从事汽车技术研究。E-mail：caishanhan5398624@163.com

中图分类号: TF76
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出版历程
- 收稿日期: 2020-01-16
- 刊出日期: 2021-02-10

Effect of titanium on microstructure and properties of steel 22MnB5 for automobile

Wang Gong^1
,,
Ji Guoshun²

1.
School of Electromechanical and Automobile, Jianghai Polytechnic College, Yangzhou 225101, Jiangshu, China
2.
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, China

摘要

摘要: 在22MnB5钢中添加不同含量的合金元素钛，制备了钛微合金化汽车用钢试样，并进行了试样显微组织、力学性能和耐腐蚀性能的测试与分析。结果表明：添加合金元素钛，有利于细化试样的内部晶粒、提高试样的力学性能和耐腐蚀性能。随钛含量从0逐渐增加至0.08%，试样内部晶粒先细化后粗化，其抗拉强度和屈服强度均先增大后减小、断后伸长率先增大后减小再增大、腐蚀电位先正移后负移，汽车用钢的力学性能和耐腐蚀性能均先提高后下降。试样钛含量优选为0.06%。与不添加钛相比，当钛含量添加至0.06%时试样的抗拉强度增加24 MPa、屈服强度增加27 MPa、腐蚀电位正移95 mV。
- 汽车用钢 /
- 22MnB5 /
- 微合金化 /
- 钛含量 /
- 力学性能 /
- 耐腐蚀性能
Abstract: The titanium microalloyed automobile steel samples were prepared by adding different content of titanium into 22MnB5 steel, and then the microstructure, mechanical properties and corrosion resistance of the samples were tested and analyzed. The results show that the addition of titanium is beneficial to refine the internal grain of the samples and improve the mechanical properties and corrosion resistance of the samples. With the increase of titanium content from 0 to 0.08%, the tensile strength and yield strength of the samples firstly increase and then decrease, the elongation after fracture firstly increases and then decreases and increases again. The corrosion potential firstly shifts forward and then negatively, and the mechanical properties and corrosion resistance of the automobile steel firstly increase and then decrease. The titanium content of the sample is preferably at 0.06%. When 0.06%Ti is added, the tensile strength of resulted steel increases by 24 MPa, the yield strength increases by 27 MPa, and the corrosion potential shifts positively by 95 mV.
- automobile steel /
- 22MnB5 /
- microalloying /
- titanium content /
- mechanical property /
- corrosion resistance

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图 1 拉伸试样尺寸(mm)

Figure 1. Geometry of tensile samples (mm)

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图 2 试样力学性能测试结果

Figure 2. Mechanical properties of test samples

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图 3 试样拉伸断口形貌SEM照片

Figure 3. SEM morphology of the fracture in samples after tensile test

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图 4 试样耐腐蚀性能测试结果

Figure 4. Corrosion testing results of the samples

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图 5 试样腐蚀试验后的表面形貌

Figure 5. Surface morphology of the samples after corrosion test

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图 6 试样显微组织

Figure 6. EBSD showing the microstructure of steels at various Ti contents

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表 1 试样化学成分

Table 1. Chemical compositions of the used steels

编号	w/%
编号	C	Si	Mn	Cr	B	Ti	Al	S	P	V
试样1	0.22±0.01	0.28±0.01	1.25±0.01	0.11±0.01	0.004±0.001	0	0.03±0.01	<0.002	<0.015	bal.
试样2	0.22±0.01	0.28±0.01	1.25±0.01	0.11±0.01	0.004±0.001	0.02	0.03±0.01	<0.002	<0.015	bal.
试样3	0.22±0.01	0.28±0.01	1.25±0.01	0.11±0.01	0.004±0.001	0.04	0.03±0.01	<0.002	<0.015	bal.
试样4	0.22±0.01	0.28±0.01	1.25±0.01	0.11±0.01	0.004±0.001	0.06	0.03±0.01	<0.002	<0.015	bal.
试样5	0.22±0.01	0.28±0.01	1.25±0.01	0.11±0.01	0.004±0.001	0.08	0.03±0.01	<0.002	<0.015	bal.

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