高温高压下超声冲击改善S30408焊接接头抗氟离子应力腐蚀性能
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摘要
通过实验研究了在高压高温环境下,超声冲击处理对S30408不锈钢焊接接头抗氟离子应力腐蚀性能的影响。结果表明:随着温度的升高和氟离子质量浓度的降低,S30408焊接接头的应力腐蚀开裂敏感性降低;冲击处理能够有效提升S30408焊接接头抗应力腐蚀开裂性能,同时也增加了S30408焊接接头的点蚀倾向。在280℃的环境下,焊接接头出现一定程度的应力松弛现象;随着实验温度升高,应力松弛程度显著增加,有效降低了材料的位错密度和腐蚀敏感性。
The effect of ultrasonic shock treatment on the resistance of S30408 stainless steel welded joints to stress corrosion by fluoride ion under high pressure and high temperature was studied experimentally. The results showed that the stress corrosion cracking sensitivity of S30408 welded joints decreased with the increase of temperature and the decrease of fluoride ion concentration. The impact treatment could effectively improve the stress corrosion cracking resistance of S30408 welded joint, and also increase the pitting corrosion tendency of S30408 welded joint. Under the condition of 280 ℃, the stress relaxation phenomenon of welded joints was observed. With the increase of test temperature, the degree of stress relaxation increases remarkably, which effectively reduces the dislocation density and corrosion sensitivity of the material.
The effect of ultrasonic shock treatment on the resistance of S30408 stainless steel welded joints to stress corrosion by fluoride ion under high pressure and high temperature was studied experimentally. The results showed that the stress corrosion cracking sensitivity of S30408 welded joints decreased with the increase of temperature and the decrease of fluoride ion concentration. The impact treatment could effectively improve the stress corrosion cracking resistance of S30408 welded joint, and also increase the pitting corrosion tendency of S30408 welded joint. Under the condition of 280 ℃, the stress relaxation phenomenon of welded joints was observed. With the increase of test temperature, the degree of stress relaxation increases remarkably, which effectively reduces the dislocation density and corrosion sensitivity of the material.
引文
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[11]谭伟,杨新俊,周新,等.超声冲击改善奥氏体不锈钢表面状态的数值分析[J].化工装备技术, 2017, 38(4):20-27.
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[13]刘国伟,尚世显,黄文龙.焊接后热与焊后热处理温度对焊接残余应力松弛的试验研究[J].压力容器,1994, 11(5):23-27.
[2]CONGLETON J, BERRISFORD R A, YANG W. Stress corrosion cracking of aensitized type 304 stainless steel in doped hightemperature water[J]. Corrosion, 1995, 51(12):901-910.
[3]ZINKLE S J, WAS G S. Materials challenges in nuclear energy[J].Acta Materialia, 2013, 61(3):735-758.
[4]SCOTT P M. Environment-assisted cracking in austenitic components[J]. International Journal of Pressure Vessels and Piping, 1996, 65(3):255-264.
[5]杨新俊.超声冲击处理改善AISI 304不锈钢表面完整性及力学性能研究[D].南京:南京工业大学, 2014.
[6]朱有利,李占明,何嘉武,等.超声冲击处理2A12铝合金焊缝表层微观组织结构变化[J].材料工程, 2009(7):79-82.
[7]房茂义,杨煜.提高碳酸钾不锈钢设备焊接接头的耐腐蚀措施[J].化工设备与防腐蚀, 2000(3):30-31, 50.
[8]马刚.超声冲击强化焊接接头抗应力腐蚀性能研究[D].南京:南京工业大学, 2010.
[9]LING X, MA G. Effect of ultrasonic impact treatment on the stress corrosion cracking of 304 stainless steel welded joints[J].Journal of Pressure Vessel Technology, 2008, 131(5):229-235.
[10]LU Z P, SHOJI T, TAKEDA Y. Effects of water chemistry on stress corrosion cracking of 316NG weld metals in high temperature water[J]. Corrosion Engineering, Science and Technology, 2015, 50(1):41-48.
[11]谭伟,杨新俊,周新,等.超声冲击改善奥氏体不锈钢表面状态的数值分析[J].化工装备技术, 2017, 38(4):20-27.
[12]张德康.不锈钢局部腐蚀[M].北京:科学出版社, 1982:285.
[13]刘国伟,尚世显,黄文龙.焊接后热与焊后热处理温度对焊接残余应力松弛的试验研究[J].压力容器,1994, 11(5):23-27.