激光表面熔凝对超级13Cr不锈钢组织与性能的影响研究

doi:10.11902/1005.4537.2019.142

中国腐蚀与防护学报

2019, Vol. 39

Issue (5): 446-452 DOI: 10.11902/1005.4537.2019.142

研究报告

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激光表面熔凝对超级13Cr不锈钢组织与性能的影响研究

付安庆¹,赵密锋²,李成政³,白艳⁴,朱文军⁵,马磊²,熊茂县²,谢俊峰²,雷晓维⁶,吕乃欣^1,⁷(

)

1. 中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室;西安 710077
2. 中国石油塔里木油田公司油气工程研究院库尔勒 841000
3. 中国石油长庆油田公司开发事业部西安 710018
4. 中国石油长庆油田公司第一采气厂榆林 718500
5. 渤海装备 (天津) 新世纪机械制造有限公司天津 300280
6. 西北工业大学理学院西安 710072
7. 长安大学材料科学与工程学院西安 710064

Effect of Laser Surface Melting on Microstructure and Performance of Super 13Cr Stainless Steel

FU Anqing¹,ZHAO Mifeng²,LI Chengzheng³,BAI Yan⁴,ZHU Wenjun⁵,MA Lei²,XIONG Maoxian²,XIE Junfeng²,LEI Xiaowei⁶,LV Naixin^1,⁷(

)

1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials of CNPC Tubular Goods Research Institute, Xi'an 710077, China
2. Oil and Gas Engineering Research Institute, PetroChina Tarim Oilfield Company, Korla 841000, China
3. Oilfield Development Division, PetroChina Changqing Oilfield Company, Xi'an 710018, China
4. No. 1 Gas Plant, PetroChina Changqing Oilfield Company, Yulin 718500, China
5. Bohai Equipment New Century Machinery Manufacturing Co. , Ltd. , Tianjin 300280, China
6. School of Science, Northwestern Polytechnical University, Xi'an 710072, China
7. School of Material Science and Engineering, Chang'an University, Xi'an 710064, China

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摘要:

研究了激光表面改性对超级13Cr不锈钢油管组织和耐蚀性能的影响。结果表明，采用200 W激光功率、5 mm/s扫描速率可在超级13Cr不锈钢表面获得厚度为200 μm的熔凝层，熔凝层与不锈钢基体之间存在厚600 μm的过渡层。激光熔凝层与过渡层均为马氏体组织，不锈钢基体为马氏体+奥氏体组织。熔凝层的硬度为410 HV，比基体硬度提高约25%；过渡层硬度为360~400 HV。与熔凝层和基体相比，过渡层的钝化区最宽、维钝电流密度最小且具有更高的点蚀电位和Kelvin电位。熔凝层的焊道界面处对局部腐蚀较为敏感。激光表面熔凝方法能显著提高超级13Cr不锈钢的表面硬度，超级13Cr耐腐蚀性能顺序为过渡层＞基体＞熔凝层，激光表面改性可在超级13Cr油管表面获得具有高耐蚀性的过渡层。

关键词 ：超级13Cr, 不锈钢, 激光熔凝, 组织, 硬度, 腐蚀

Abstract：

Surface re-melted layer was obtained on super 13Cr stainless steel via laser surface melting (LSM) treatment, then, of which the microstructure, micro-hardness and corrosion performance were characterized by means of optical microscope, scanning electron microscope, X-ray diffractometer, micro-hardness tester, immersion test and scanning micro-zone electrochemical workstation. It is found that with a laser beam of 200 W and 5 mm/s of laser scanning speed, the LSM treatment could produce a remelting surface composed of 200 μm thick LSM layer and a 600 μm thick transition layer on the steel surface. The above two layers all show martensite microstructure, while the steel matrix is comprised of martensite and austenite. The micro-hardness of the LSM layer is 410 HV, which is 25% higher than the hardness of steel matrix, while that of the transition layer is 360~400 HV. Moreover, comparing with the LSM layer and steel matrix, the transition layer shows the widest passive range, lowest passive current density, and highest pitting potential and Kelvin potential. In addition, the inter-pass interface of the LSM layer is sensitive to localized corrosion. It is concluded that LSM treatment can significantly enhance the surface hardness of super 13Cr stainless steel, and the corrosion resistance of super 13Cr lies in the order of transition layer＞steel matrix＞LSM layer, indicating that a highly corrosion-resistant transition layer can be obtained on the steel surface via laser surface modification.

Key words： super 13Cr stainless steel surface laser melting microstructure hardness corrosion

收稿日期: 2019-09-05

ZTFLH:

TG178

基金资助:国家科技重大专项(2016ZX05051);中石油重大科技专项(2018E-1809);陕西省创新人才推进计划-青年科技新星项目(2017KJXX-03)

通讯作者: 吕乃欣 E-mail: lvnx@cnpc.com.cn

Corresponding author: Naixin LV E-mail: lvnx@cnpc.com.cn

作者简介: 付安庆，男，1981年生，博士，高级工程师

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引用本文:

付安庆,赵密锋,李成政,白艳,朱文军,马磊,熊茂县,谢俊峰,雷晓维,吕乃欣. 激光表面熔凝对超级13Cr不锈钢组织与性能的影响研究[J]. 中国腐蚀与防护学报, 2019, 39(5): 446-452.
Anqing FU, Mifeng ZHAO, Chengzheng LI, Yan BAI, Wenjun ZHU, Lei MA, Maoxian XIONG, Junfeng XIE, Xiaowei LEI, Naixin LV. Effect of Laser Surface Melting on Microstructure and Performance of Super 13Cr Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 446-452.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.142 或 https://www.jcscp.org/CN/Y2019/V39/I5/446

图1 超级13Cr不锈钢激光表面熔凝样品沿厚度方向的横截面组织形貌

图2 激光表面熔凝层的表面和界面形貌

图3 横截面的显微硬度分析部位及硬度曲线

图4 熔凝层横截面不同部位的显微硬度，上表面测试点及上表面硬度曲线

图5 超级13Cr不锈钢在3.5%NaCl溶液中的动电位极化曲线

图6 超级13Cr不锈钢在3.5%NaCl溶液中的EIS曲线

图7 超级13Cr不锈钢在6%FeCl3溶液中浸泡24 h后的SEM截面形貌

图8 超级13Cr不锈钢经LSM处理后各区域的SKP微区电化学分析结果

图9 超级13Cr不锈钢经LSM处理后各区域的XRD谱分析结果

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