V和Ti元素对耐候钢过冷奥氏体连续冷却相变行为的影响研究

崔凯禹; 李正荣; 赵征志; 叶晓瑜; 汪创伟; 张开华; 胡云凤; 熊雪刚

doi:10.7513/j.issn.1004-7638.2022.03.021

V和Ti元素对耐候钢过冷奥氏体连续冷却相变行为的影响研究

doi: 10.7513/j.issn.1004-7638.2022.03.021

1.
钒钛资源综合利用国家重点实验室, 四川攀枝花 617000
2.
哈尔滨工业大学材料科学与工程学院, 黑龙江哈尔滨 150000
3.
北京科技大学钢铁共性技术协同创新中心, 北京 100000

详细信息

作者简介:
崔凯禹(1990—)，男，硕士，高级工程师，主要从事钢铁新材料的研发和工艺研究，E-mail:cuiky@qq.com

中图分类号: TF841.3,TF823,TG115
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-30
- 刊出日期: 2022-06-30

Investigation on the effects of V and Ti on continuous cooling transformation behaviour of weathering steel

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000， Sichuan, China
2.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150000, Heilongjiang, China
3.
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100000, China

摘要

摘要: 进行了V、Ti元素含量不同的耐候钢的过冷奥氏体连续冷却转变热模拟试验并绘制了CCT曲线，研究了不同冷却速度以及V、Ti元素对耐候钢组织转变以及性能的影响。当V含量由0.03%提高至0.07%，马氏体转变开始温度M_s提高25 ℃，促进了马氏体相变。当Ti含量由0.03%提高至0.10%，扩大了贝氏体相变区、降低了贝氏体开始转变冷速，促进了贝氏体转变；同时，马氏体转变开始温度M_s降低22 ℃、马氏体转变终了温度M_f升高18 ℃，马氏体转变区域变窄，抑制了马氏体转变。随着冷却速率的提高，HV0.2硬度值逐渐增加。HV0.2硬度值主要受金相组织的尺寸和形貌影响，V、Ti的第二相析出物对HV0.2硬度值的影响不大。
- 耐候钢 /
- CCT曲线 /
- 钒 /
- 钛 /
- 贝氏体 /
- 马氏体 /
- 硬度
Abstract: Continuous cooling transformation thermal simulation experiment of weathering steel with various V or Ti contents was conducted, and effects of cooling rate and V or Ti element on microstructure transformation and property of weathering steel were investigated. When V content increases from 0.03% to 0.07%, the martensite-start temperature increases 25 ℃, thereby promoting martensitic phase transformation. When Ti content increases from 0.03% to 0.10%, the bainitic phase transformation region expands, and the cooling rate with which bainite transformation starts decreases, thereby promoting bainitic phase transformation; meanwhile, martensite-start temperature decreases 22 ℃, and martensite-finish temperature increases 18 ℃, inducing martensitic phase transformation region shrinks, thereby restraining martensitic phase transformation. With the cooling rate increasing, HV0.2 hardness increases. HV0.2 hardness is mainly affected by the size and morphology of metallographic structure but fewer affected by second phase precipitates of V or Ti.
- weathering steel /
- CCT curve /
- vanadium /
- titanium /
- bainite /
- martensite /
- hardness

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图 1 临界点测定热模拟试验工艺

Figure 1. Thermal simulation experiment technology of critical temperature measurement

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图 2 连续冷却热模拟试验工艺

Figure 2. Continuous cooling thermal simulation experiment technology

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图 3 0.03V试验钢在不同冷却速率条件下的显微组织

Figure 3. Microstructures of 0.03 V tested steel with various cooling rates

(a) 0.1 ℃/s; (b) 0.5 ℃/s; (c) 1 ℃/s; (d) 3 ℃/s; (e) 5 ℃/s; (f) 7 ℃/s; (g) 10 ℃/s; (h) 20 ℃/s; (i) 30 ℃/s; (j) 50 ℃/s

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图 4 0.07V试验钢在不同冷却速率条件下的显微组织

Figure 4. Microstructures of 0.07V tested steel with various cooling rates

(a) 0.1 ℃/s; (b) 0.5 ℃/s; (c) 1 ℃/s; (d) 3 ℃/s; (e) 5 ℃/s; (f) 7 ℃/s; (g) 10 ℃/s; (h) 20 ℃/s; (i) 30 ℃/s; (j) 50 ℃/s

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图 5 过冷奥氏体连续冷却转变曲线

（a）0.03V试验钢；(b）0.07V试验钢

Figure 5. Continuous cooling transformation curve

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图 6 0.03Ti试验钢在不同冷却速率条件下的显微组织

Figure 6. Microstructures of 0.03Ti tested steel with various cooling rates

(a) 0.1 ℃/s; (b) 0.5 ℃/s; (c) 1 ℃/s; (d) 3 ℃/s; (e) 5 ℃/s; (f) 7 ℃/s; (g) 10 ℃/s; (h) 20 ℃/s; (i) 30 ℃/s; (j) 50 ℃/s

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图 7 0.10Ti试验钢在不同冷却速率条件下的显微组织

Figure 7. Microstructures of 0.10Ti tested steel with various cooling rates

(a) 0.1 ℃/s;(b) 0.5 ℃/s; (c) 1 ℃/s; (d) 3 ℃/s; (e) 5 ℃/s; (f) 7 ℃/s; (g) 10 ℃/s; (h) 20 ℃/s; (i) 30 ℃/s; (j) 50 ℃/s

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图 8 过冷奥氏体连续冷却转变曲线

（a） 0.03Ti试验钢；（b） 0.10Ti试验钢

Figure 8. Continuous cooling transformation curve

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表 1 试验钢化学成分

Table 1. Compositions of tested steel %

编号	C	Si	Mn	P	S	Cu	Ni	Cr	V	Ti	Als	N
0.03V	0.07	0.39	1.42	0.010	0.002	0.36	0.31	0.64	0.030		0.023	0.0164
0.07V	0.06	0.39	1.43	0.009	0.001	0.35	0.31	0.63	0.070		0.027	0.0163
0.03Ti	0.07	0.40	1.43	0.005	0.002	0.35	0.31	0.63		0.035	0.043	0.0024
0.10Ti	0.07	0.41	1.41	0.005	0.002	0.34	0.31	0.63		0.100	0.035	0.0026

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表 2 V含量不同的试验钢硬度（HV0.2）

Table 2. Hardness of tested steel with various V content (HV0.2)

冷速/（℃·s⁻¹）	0.03V试验钢				0.07V试验钢
冷速/（℃·s⁻¹）	硬度（HV0.2）			平均值	硬度（HV0.2）			平均值
0.1	160.8	168.6	170.4	166.6	155.7	164.4	159.6	159.9
0.5	180.4	182.3	189.6	184.1	183.2	182.3	184.6	183.4
1	208.3	208.3	209.3	208.6	192.5	190.7	193.6	192.3
3	226.6	220.3	221.6	222.8	219.6	220.6	223.4	221.2
5	228.4	226.6	225.3	226.8	228.4	230.6	232.3	230.4
7	227.2	230.6	232.8	230.2	240.1	238.9	236.4	238.5
10	242.6	240.6	246.6	243.3	240.1	245.1	246.4	243.9
20	269.3	270.0	264.6	268.0	259.6	260.4	262.4	260.8
30	273.9	279.9	275.6	276.5	285.2	281.4	275.4	280.7
50	287.8	290.6	284.6	287.7	283.9	287.8	284.6	285.4

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表 3 Ti含量不同的试验钢硬度（HV0.2）

Table 3. Hardness of tested steel with various Ti content (HV0.2)

冷速/（℃·s⁻¹）	0.03Ti试验钢				0.10Ti试验钢
冷速/（℃·s⁻¹）	硬度（HV0.2）			平均值	硬度（HV0.2）			平均值
0.1	156.7	153.1	153.5	154.4	147.2	148.6	146.3	147.4
0.5	167.2	161.7	162.3	163.7	188.1	187.3	185.6	187.0
1	175.3	176.3	178.4	176.7	193.8	193.2	197.6	194.9
3	188.1	189.6	186.3	188.0	201.5	200.6	201.4	201.2
5	215.4	210.3	209.6	211.8	215.4	215.4	216.1	215.6
7	217.4	219.6	220	219.0	222.8	223.9	222.4	223.0
10	225	226.1	228.9	226.7	234.1	227.9	230.4	230.8
20	240.6	242.6	243.9	242.4	240.1	252.8	241.4	244.8
30	263.8	266.6	267.9	266.1	269.5	272.4	271.4	271.1
50	294.3	287.8	286.4	289.5	289.4	294.3	290.3	291.3

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