双相钢焊接接头微观组织表征及性能分析
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摘要
针对S22053双相钢的氩弧焊多层多道焊接接头,通过力学性能试验对接头的强度、硬度及冲击性能进行了测试,并对接头各区域的组织进行了分析,依据ASTM A923《检测锻制双重奥氏体-铁素体不锈钢中有害金属间相的标准试验方法》对接头的耐点蚀性能进行了测试,测试结果表明:S22053多层多道焊接接头具有良好的综合力学性能及耐腐蚀性能;焊缝区及热影响区组织为奥氏体和铁素体,其中铁素体含量分别为48. 9%及62. 43%,焊缝区及热影响区的奥氏体包含晶粒边界奥氏体、魏氏奥氏体以及晶粒内奥氏体组织,且元素分布存在一定差异;在奥氏体相中易于富集Ni,N元素,Cr,Mo元素富集于铁素体相。
The strength,hardness and absorbed energy of the S22053 multi-pass welded joint were tested by GTAW. OM,SEM,EDS were employed to research the microstructure distribution in different zones in welded joint. Pitting corrosion resistance property was measured by A method and C method of ASTM A923-03. The results shows that the excellent integrated mechanical properties and good corrosion resistance property are obtained in the multi-pass welded joint of S22053. Microstructures in fusion zone and HAZ are Austenitic and Ferrite,the amounts of Ferrite in welds and HAZ are 48. 9% and 62. 43% respectively. The austenite in the fusion zone and the HAZ mainly consists of grain boundary austenite,Widma-nstatten austenite and intragranular austenite. Composition differences are found obvious in the different types of austenite. Ni and N elements tend to be enriched in austenite,whereas Cr and Mo element tend to be enriched in Ferrite.
The strength,hardness and absorbed energy of the S22053 multi-pass welded joint were tested by GTAW. OM,SEM,EDS were employed to research the microstructure distribution in different zones in welded joint. Pitting corrosion resistance property was measured by A method and C method of ASTM A923-03. The results shows that the excellent integrated mechanical properties and good corrosion resistance property are obtained in the multi-pass welded joint of S22053. Microstructures in fusion zone and HAZ are Austenitic and Ferrite,the amounts of Ferrite in welds and HAZ are 48. 9% and 62. 43% respectively. The austenite in the fusion zone and the HAZ mainly consists of grain boundary austenite,Widma-nstatten austenite and intragranular austenite. Composition differences are found obvious in the different types of austenite. Ni and N elements tend to be enriched in austenite,whereas Cr and Mo element tend to be enriched in Ferrite.
引文
[1]张志强,荆洪阳,徐连勇,等.双相不锈钢多层多道焊接接头微观组织表征[J].焊接学报,2017,38(5):79-82.
[2]包晔峰,胡网勤,蒋永峰,等.2205双相不锈钢焊接接头微区耐点蚀性能分析[J].焊接学报,2011,32(11):81-84.
[3]金晓军,霍立兴,张玉凤,等.热输入对双相不锈钢管接头力学和腐蚀性能的影响[J].焊接学报,2004,25(3):109-112.
[4]Devendranath Ramkumar K,Thiruvengatam G,Sudharsan SP,et al.Characterization of weld strength and impact toughness in the multi-pass welding of super-duplex stainless steel UNS 32750[J].Materials&Design,2014,60:125-135.
[5]Mcpherson N A,Li Y,Baker T N.Microstructure and properties of as welded duplex stainless steel[J].Science and Technology of Welding and Joining,2000,5(4):235-244.
[2]包晔峰,胡网勤,蒋永峰,等.2205双相不锈钢焊接接头微区耐点蚀性能分析[J].焊接学报,2011,32(11):81-84.
[3]金晓军,霍立兴,张玉凤,等.热输入对双相不锈钢管接头力学和腐蚀性能的影响[J].焊接学报,2004,25(3):109-112.
[4]Devendranath Ramkumar K,Thiruvengatam G,Sudharsan SP,et al.Characterization of weld strength and impact toughness in the multi-pass welding of super-duplex stainless steel UNS 32750[J].Materials&Design,2014,60:125-135.
[5]Mcpherson N A,Li Y,Baker T N.Microstructure and properties of as welded duplex stainless steel[J].Science and Technology of Welding and Joining,2000,5(4):235-244.