SAE1144易切削钢八角棒表面裂纹缺陷分析

王高峰; 钟亮美; 周楠; 张志明; 付建勋

doi:10.7513/j.issn.1004-7638.2022.01.029

SAE1144易切削钢八角棒表面裂纹缺陷分析

doi: 10.7513/j.issn.1004-7638.2022.01.029

1.
省部共建高品质特殊钢冶金与制备国家重点实验室, 上海市钢铁冶金新技术开发应用重点实验室, 上海大学材料科学与工程学院, 上海 200072
2.
广东韶钢松山股份有限公司, 广东韶关 512123

基金项目: 国家自然科学基金（51874195）；2020年广东省科技专项（200720154531804）

详细信息

作者简介:
王高峰（1994—），男，硕士生，研究方向：高品质特殊钢中夹杂物分析，E-mail：wanggf907@163.com

通讯作者:
付建勋（1969—），男，博士，教授，研究方向：高品质特殊钢的开发与品质提升，E-mail：fujianxun@shu.edu.cn

中图分类号: TF76,TG115
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- 文章访问数: 276
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-16
- 网络出版日期: 2022-04-24
- 刊出日期: 2022-02-28

Analysis on surface crack defects of SAE1144 free-cutting octagonal steel bar

1.
State Key Laboratory of Metallurgy and Preparation of High Quality Special Steel Jointly Built by the Provincial and Ministry, Shanghai Key Laboratory of New Technology Development and Application of Iron and Steel Metallurgy, School of Material Science and Engineering, Shanghai University, Shanghai 200072, China
2.
SGIS Songshan Co., Ltd., Shaoguan 512123, Guangdong, China

摘要

摘要: 采用光学显微镜、小样电解、扫描电镜及能谱、ImageJ软件等分析检测方法，对SAE1144易切削钢由18 mm圆棒冷拉拔至15 mm八角棒过程中产生表面裂纹的区域进行研究。结果表明：八角棒裂纹扩展区有大颗粒状MnS夹杂、细长条形团簇状MnS夹杂以及大块的FeO夹杂，开裂面有大量密集的细长条状MnS；而大块的FeO夹杂是裂纹产生的微裂纹源，大颗粒状MnS夹杂、细长条形团簇状MnS夹杂是裂纹扩展的主要原因。
- SAE1144 /
- 易切削钢 /
- 八角棒 /
- 表面裂纹 /
- 硫化锰
Abstract: The surface crack area of SAE1144 free cutting steel during cold drawing from 18 mm round bar to 15 mm octagonal bar was studied by means of optical microscope, sample electrolysis, SEM+EDS and ImageJ software. The results show that there exist large granular MnS inclusions, elongated strip cluster MnS inclusions and massive FeO inclusions in the crack propagation zone of octagonal bar, and lots of dense elongated strip MnS present on the crack surface. The large FeO inclusions are the source of microcracks, and the large granular MnS inclusions and elongated strip cluster MnS inclusions are the main causes of crack propagation.
- SAE1144 /
- free-cutting steel /
- octagonal bar /
- surface crack /
- manganese sulfide

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图 1 试样宏观形貌

Figure 1. Macro morphology of samples

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图 2 取样示意

Figure 2. Schematic diagram of sampling

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图 3 裂纹金相照片

Figure 3. Metallographic photos of cracks

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图 4 八角棒近表面至1/3间夹杂物

Figure 4. Inclusions between sub-surface and 1/3 of octagonal bar

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图 5 截面裂纹

Figure 5. Crack cross section

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图 6 观察面1的能谱分析

Figure 6. EDS analysis of observation surface 1

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图 7 腐蚀前裂纹内壁形貌

Figure 7. Crack inner wall morphology before corrosion

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图 8 腐蚀后裂纹内壁形貌

Figure 8. Crack inner wall morphology after corrosion

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图 9 裂纹内壁夹杂物及能谱

Figure 9. Inclusion and its energy spectrum analysis in crack inner wall

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图 10 金相照片典型视场

Figure 10. Typical field of metallographic photograph

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表 1 SAE1144的化学成分

Table 1. Chemical compositions of SAE1144 %

C Si Mn P S

内控上限 0.47 0.25 1.52 <0.025 0.300
内控下限 0.43 0.18 1.45 0.240
目标 0.45 0.22 1.47 ≤0.024 0.270
实测 0.46 0.23 1.47 0.023 0.256

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表 2 图6中观察面1的能谱分析结果（原子分数）

Table 2. EDS analysis results of observation surface 1 in Fig. 6（atomic fraction） %

No. Mn S Fe O

(1) 3.24 1.62 85.59 9.56
(2) 4.60 2.92 82.47 10.01
(3) 88.26 11.74

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