22MnCrNiMo钢疲劳腐蚀性能研究

戴益波; 高平; 郭宇航

doi:10.7513/j.issn.1004-7638.2021.02.028

22MnCrNiMo钢疲劳腐蚀性能研究

doi: 10.7513/j.issn.1004-7638.2021.02.028

江苏科技大学材料科学与工程学院，江苏镇江 212003

详细信息

作者简介:
戴益波(1995—)，男，江苏盐城人，硕士，通讯作者，主要研究方向为金属腐蚀与防护。E-mail：justybdai@163.com

中图分类号: TF762, TG172
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-08
- 刊出日期: 2021-04-10

Research on fatigue corrosion behavior of 22MnCrNiMo steel

Department of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China

摘要

摘要: 采用海水挂片试验和腐蚀疲劳试验对R4s (22MnCrNiMo)级钢的耐腐蚀机理和腐蚀疲劳性能进行了研究，腐蚀时间选择为30、60 、90 d。结果表明：腐蚀初期，22MnCrNiMo钢的腐蚀机理为点蚀的局部腐蚀，随着时间的增加转变为点蚀的均匀腐蚀。当腐蚀时间到90 d时，试样表面已完全被花状腐蚀产物覆盖，整个腐蚀过程中，22MnCrNiMo钢的腐蚀速率在0.035～0.045 g/(m²·h)。22MnCrNiMo钢腐蚀疲劳的幂函数表达式为：S=14 000.12×N ^{−0.266 4}，其疲劳极限约为190 MPa。在电化学效应和交变应力以及侵蚀性离子的作用下，试样的裂纹扩展速度增加，断裂时间提前。
- 22MnCrNiMo钢 /
- 点蚀 /
- 耐蚀性 /
- 腐蚀疲劳
Abstract: In this paper, the corrosion resistance mechanism and corrosion fatigue performance of R4s (22MnCrNiMo) grade steel were studied by means of seawater coupon test and corrosion fatigue test. The choice of corrosion time was 30 d, 60 d and 90 d, respectively. The experimental results show that in the initial stage of corrosion, the corrosion mechanism of 22MnCrNiMo steel is localized corrosion of pitting corrosion, which changes into uniform corrosion of pitting corrosion as time extends. When the corrosion time reaches to 90 d, the surface of the sample is completely covered with flower-like corrosion products. During the entire corrosion process, the corrosion rate of 22MnCrNiMo steel is between 0.035～0.045 g/(m²·h). The power function expression of corrosion fatigue of 22MnCrNiMo steel is: S=14 000.12×N ^{−0.266 4}, and its fatigue limit is about 190 MPa. Subject to electrochemical effect, alternating stress and aggressive ions effects, the crack propagation speed of the sample increases, and the fracture occurs in advance.
- 22MnCrNiMo steel /
- pitting /
- corrosion resistance /
- corrosion fatigue

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图 1 腐蚀疲劳标准试样

Figure 1. Corrosion fatigue standard sample

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图 2 海水挂片腐蚀速率

Figure 2. Corrosion rate of seawater coupon.

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图 3 海水挂片经30 d腐蚀表面形貌SEM形貌及放大图

Figure 3. SEM of corrosion surface morphology of seawater coupon after 30 days.

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图 4 海水挂片经60 d腐蚀表面形貌SEM形貌及放大图

Figure 4. SEM of corrosion surface morphology of seawater coupon after 60 days.

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图 5 海水挂片经90 d腐蚀表面形貌SEM形貌

Figure 5. SEM of corrosion surface morphology of seawater coupon after 60 days.

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图 6 22MnCrNiMo钢腐蚀疲劳S-N曲线

Figure 6. 22MnCrNiMo steel corrosion fatigue S-N curve

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图 7 幂函数公式下22MnCrNiMo S-N曲线

Figure 7. S-N curve of 22MnCrNiMo steel

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图 8 试样腐蚀疲劳断裂断口SEM形貌

Figure 8. SEM of corrosion fatigue macro-fracture (a) and cracks initiation phase fracture (b)

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图 9 试样腐蚀疲劳裂纹扩展阶段和瞬断区SEM形貌

Figure 9. SEM of the first (a) and second (b) stage and blink-off zone (c) of the corrosion fatigue crack growth stage

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图 10 试样腐蚀疲劳断口EDS分析

Figure 10. EDS analysis results of corrosion fatigue fracture

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表 1 22MnCrNiMo钢的化学成分

Table 1. Chemical compositions of the steel 22MnCrNiMo %

C	Si	Mn	P	S	Cr	Ni
0.24～0.30	0.15～0.30	1.20～1.60	≤0.025	≤0.025	0.80～1.30	0.70～1.30

Cu	Al	Mo	Nb	[O]	[N]	[H]
≤0.20	0.020～0.050	0.40～0.80	0.02～0.06	≤25 ×10⁻⁴	≤90 ×10⁻⁴	≤2 ×10⁻⁴

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表 2 人工海水成分配比

Table 2. Chemical compositions of artificial seawater

名称	化学式	分子量	用量/( g·L⁻¹)
无水硫酸钠	Na₂SO₄	142.04	4.00
氯化钠	NaCl	58.44	25.00
氯化镁	MgCl₂·6H₂O	203.30	11.00
氯化钙	CaCl₂	111.00	1.20

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