316LN不锈钢焊接接头的晶间腐蚀

doi:10.11901/1005.3093.2014.455

材料研究学报

2015, Vol. 29

Issue (4): 299-306 DOI: 10.11901/1005.3093.2014.455

本期目录 | 过刊浏览

316LN不锈钢焊接接头的晶间腐蚀

王东东¹(

),梁灿¹,白文杰¹,李涌泉²,段权¹

1. 西安交通大学化学工程与技术学院西安 710049
2. 中国特种设备检测研究院北京 100000

Intergranular Corrosion of 316LN Stainless Steel Welded Joints

Dongdong WANG^1,^**(

),Can LIANG¹,Wenjie BAI¹,Yongquan LI²,Quan DUAN¹

1. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
2. China Special Equipment Inspection and Research Institute, Beijing 100000, China

引用本文:

王东东,梁灿,白文杰,李涌泉,段权. 316LN不锈钢焊接接头的晶间腐蚀[J]. 材料研究学报, 2015, 29(4): 299-306.
Dongdong WANG, Can LIANG, Wenjie BAI, Yongquan LI, Quan DUAN. Intergranular Corrosion of 316LN Stainless Steel Welded Joints[J]. Chinese Journal of Materials Research, 2015, 29(4): 299-306.

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摘要:

研究了热输入量不同的316LN不锈钢焊接接头在沸腾硝酸溶液中的晶间腐蚀特性, 结果表明: 焊接热输入量越大, 焊接接头的抗晶间腐蚀性能越差; 焊接接头焊缝区抗晶间腐蚀能力高于热影响区和母材区; 晶间腐蚀过程可分为氧化、钝化、氧化膜裂纹萌生、氧化膜裂纹扩展和高速晶间腐蚀等阶段; 在不同阶段声发射信号中氧化信号在20 kHz的频率位置有能量峰, 钝化信号在40 kHz频率处有明显能量峰的突发型信号, 氧化膜裂纹萌生信号在80-100 kHz的频率段内有明显能量峰的突发型信号, 氧化膜裂纹扩展信号具有60 kHz倍频关系, 高速晶间腐蚀信号是一种持续时间稍长的突发型信号, 在50 kHz处有明显的能量峰。

关键词 ：材料失效与保护, 晶间腐蚀, 声发射, 316LN, 金相分析

Abstract：

The intergranular corrosion characteristics of 316LN austenitic stainless steel welded joints with different welding heat input in boiling nitric acid solution were investigated by metallography analysis and acoustic emission technology. The results show that the resistance to intergranular corrosion of welded joints deteriorated with the increasing welding heat input. The intergranular corrosion resistance of the weld zone is better than that of the heat affected zone and the base material. Five stages for the intergranular corrosion process can be differentiated according to the characteristics of the detected acoustic emission spectrum, such as oxidation, passivation, oxide film crack initiation, oxide film crack propagation and finally fast intergranular corrosion. In other words, in the acoustic emission spectrum, there exist an obvious energy peak by 20 kHz representing the oxidation signal; an obvious energy peak by 40 kHz of a burst-like signal representing the stage of passivation process; energy peaks in a range 80 to 100 kHz of burst-like signal representing the oxide film crack initiation; energy peaks by frequency of 60 kHz representing the stage of crack propagation; and finally a peak by 50 kHz of a burst-like signal with a slightly longer duration representing the stage of fast intergranular corrosion.

Key words： materials failure and protection intergranular corrosion acoustic emission technology 316LN metallography analysis

收稿日期: 2014-08-25

基金资助:* 国家科技重大专项课题2011ZX06004-009资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.455 或 https://www.cjmr.org/CN/Y2015/V29/I4/299

图1 金相试样的腐蚀速率图

图2 不同组织前4个周期的晶间腐蚀金相图

图3 试样晶间腐蚀过程的总计数变化图

图4 试样晶间腐蚀过程的总能量变化图

图5 不同阶段的声发射信号幅值变化图

图6 不同声发射信号的小波降噪重构图

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