2209和2507双相不锈钢堆焊层组织结构及耐蚀性对比
|
摘要
利用光学显微镜、X射线衍射仪、扫描电子显微镜和能谱仪等,对2209和2507双相不锈钢FCAW堆焊层焊态、退火态的组织结构和耐蚀性进行对比研究。结果表明:两种堆焊层焊态时均主要由铁素体α和魏氏体状奥氏体γ组成,在α晶内及α/γ界面处存在少量细条状的二次奥氏体γ_2,在α/γ、α/α界面处还存在极少量的点状σ相;两种堆焊层经690℃×8 h退火后,σ相和γ_2均明显增多。两种堆焊层焊态的耐蚀性均合格,且2507型堆焊层的耐蚀性优于2209型堆焊层;而两种堆焊层退火态的耐蚀性均急剧下降、严重不合格,这主要是由于退火过程中堆焊层内析出大量σ相和γ_2所致。
Microstructure and corrosion resistance of 2209 and 2507 duplex stainless steel FCAW surfaced layers were comparatively investigated by means of optical microscope,X ray diffractometer,scanning electron microscope and energy dispersive spectrometer,etc.The results show that two kinds of welded surfacing layers are mainly composed of ferrite α and austenite γ like widmanstatten,there is a small amount of thin lath γ_2 in α grains or between the α / γ interface,while there is very little punctiform σ phase between the α / γ or α / αinterface. After 690 ℃ × 8 h annealing process,the amount of σ phase and γ_2 in two kinds of surfacing layers increases obviously. The corrosion resistance of two kinds of welded surfacing layers all meet the relevant standards,and the corrosion resistance of 2507 surfacing layers is better than that of 2209 surfacing layers,but the corrosion resistance of two kinds of annealed surfacing layers decreases sharply and doesn't meet the relevant standard seriously,that is mainly because a large number of σ phase and γ_2 precipitated in the surfacing layers during annealing process.
Microstructure and corrosion resistance of 2209 and 2507 duplex stainless steel FCAW surfaced layers were comparatively investigated by means of optical microscope,X ray diffractometer,scanning electron microscope and energy dispersive spectrometer,etc.The results show that two kinds of welded surfacing layers are mainly composed of ferrite α and austenite γ like widmanstatten,there is a small amount of thin lath γ_2 in α grains or between the α / γ interface,while there is very little punctiform σ phase between the α / γ or α / αinterface. After 690 ℃ × 8 h annealing process,the amount of σ phase and γ_2 in two kinds of surfacing layers increases obviously. The corrosion resistance of two kinds of welded surfacing layers all meet the relevant standards,and the corrosion resistance of 2507 surfacing layers is better than that of 2209 surfacing layers,but the corrosion resistance of two kinds of annealed surfacing layers decreases sharply and doesn't meet the relevant standard seriously,that is mainly because a large number of σ phase and γ_2 precipitated in the surfacing layers during annealing process.
引文
[1]吴玖.双相不锈钢[M].北京:冶金工业出版社,1999.
[2]郭文彬,王庆红.双相不锈钢2507堆焊[J].中国化工装备,2011,13(4):17-19.Guo Wenbin,Wang Qinghong.2507 duplex stainless steel surfacing[J].China Chemical Industry Equipment,2011,13(4):17-19.
[3]潘清泉,秦大秋,肖力,等.换热器管板双相不锈钢堆焊及管板与换热管管头焊接[J].中国化工装备,2009,11(2):33-36.Pan Qingquan,Qin Daqiu,Xiao Li,et al.Surfacing on duplex stainless steel tube-plate of heat exchanger and welding on tube-port of heat exchanging tube[J].China Chemical Industry Equipment,2009,11(2):33-36.
[4]陈裕川.现代奥氏体-铁素体双相不锈钢的焊接(一)[J].现代焊接,2011(12):10-16.Chen Yuchuan.The welding of modern austenite-ferrite duplex phase stainless steel(Ⅰ)[J].Modern Welding,2011(12):10-16.
[5]陈裕川.现代奥氏体-铁素体双相不锈钢的焊接(二)[J].现代焊接,2012(1):14-21.Chen Yuchuan.The welding of modern austenite-ferrite duplex phase stainless steel(Ⅱ)[J].Modern Welding,2012(1):14-21.
[6]陈裕川.现代奥氏体-铁素体双相不锈钢的焊接(三)[J].现代焊接,2012(2):15-22.Chen Yuchuan.The welding of modern austenite-ferrite duplex phase stainless steel(Ⅲ)[J].Modern Welding,2012(2):15-22.
[7]刘玉华.S31803(SAF2205)双相不锈钢带极堆焊焊接工艺的确定[J].现代焊接,2008(10):41-43.Liu Yuhua.Determination of the welding process of S31803(SAF2205)two-phase stainless steel strip surfacing[J].Modern Welding,2008(10):41-43.
[8]郗峰波,符治,李晴,等.CO_2气保焊药芯焊丝堆焊不锈钢评定试验[J].现代焊接,2011(7):45-47.Xi Fengbo,Fu Zhi,Li Qing,et al.Test for the evaluation on stainless steel of surfacing of flux-cored wire used in CO2gas shielding welding[J].Modern Welding,2011(7):45-47.
[9]刘玉华.CO_2药芯焊丝气保焊(FCAW)在加氢反应器接管内壁不锈钢堆焊中的应用[J].金属加工(热加工),2009(12):25-28.
[10]郭保平,朱敏,任世宏,等.焊后热处理对双相不锈钢带极堆焊层组织性能的影响[J].石油化工设备,2013,42(8):50-53.Guo Baoping,Zhu Min,Ren Shihong,et al.Influence of post weld heat treatment to duplex stainless steels overlaying layer[J].PetroChemical Equipment,2013,42(8):50-53.
[11]俄馨,史伟,他进国,等.退火对2209双相不锈钢堆焊层组织和性能的影响[J].金属热处理,2015,40(6):138-141.E Xin,Shi Wei,Ta Jinguo,et al.Influence of annealing on microstructure and mechanical properties of 2209 duplex stainless steel surfacing layer[J].Heat Treatment of Metals,2015,40(6):138-141.
[12]陈嘉砚,杨卓越,杨武,等.双相不锈钢中σ相的形成特点及其对性能的影响[J].钢铁研究学报,2006,18(8):1-4.Chen Jiayan,Yang Zhuoyue,Yang Wu,et al.Characteristic of phaseσprecipitation and its effects on behavior in duplex stainless steel[J].Journal of Iron and Steel Research,2006,18(8):1-4.
[13]Ramirez A J,Lippold J C,Brandi S D.The relationship between chromium nitride and secondary austenite precipitation in duplex stainless steels[J].Metallurgical and Materials Transactions A,2003,34(8):1575-1597.
[14]Lippold J C,Kotecki D J.不锈钢焊接冶金学及焊接性[M].陈剑虹,译.北京:机械工业出版社,2008.
[2]郭文彬,王庆红.双相不锈钢2507堆焊[J].中国化工装备,2011,13(4):17-19.Guo Wenbin,Wang Qinghong.2507 duplex stainless steel surfacing[J].China Chemical Industry Equipment,2011,13(4):17-19.
[3]潘清泉,秦大秋,肖力,等.换热器管板双相不锈钢堆焊及管板与换热管管头焊接[J].中国化工装备,2009,11(2):33-36.Pan Qingquan,Qin Daqiu,Xiao Li,et al.Surfacing on duplex stainless steel tube-plate of heat exchanger and welding on tube-port of heat exchanging tube[J].China Chemical Industry Equipment,2009,11(2):33-36.
[4]陈裕川.现代奥氏体-铁素体双相不锈钢的焊接(一)[J].现代焊接,2011(12):10-16.Chen Yuchuan.The welding of modern austenite-ferrite duplex phase stainless steel(Ⅰ)[J].Modern Welding,2011(12):10-16.
[5]陈裕川.现代奥氏体-铁素体双相不锈钢的焊接(二)[J].现代焊接,2012(1):14-21.Chen Yuchuan.The welding of modern austenite-ferrite duplex phase stainless steel(Ⅱ)[J].Modern Welding,2012(1):14-21.
[6]陈裕川.现代奥氏体-铁素体双相不锈钢的焊接(三)[J].现代焊接,2012(2):15-22.Chen Yuchuan.The welding of modern austenite-ferrite duplex phase stainless steel(Ⅲ)[J].Modern Welding,2012(2):15-22.
[7]刘玉华.S31803(SAF2205)双相不锈钢带极堆焊焊接工艺的确定[J].现代焊接,2008(10):41-43.Liu Yuhua.Determination of the welding process of S31803(SAF2205)two-phase stainless steel strip surfacing[J].Modern Welding,2008(10):41-43.
[8]郗峰波,符治,李晴,等.CO_2气保焊药芯焊丝堆焊不锈钢评定试验[J].现代焊接,2011(7):45-47.Xi Fengbo,Fu Zhi,Li Qing,et al.Test for the evaluation on stainless steel of surfacing of flux-cored wire used in CO2gas shielding welding[J].Modern Welding,2011(7):45-47.
[9]刘玉华.CO_2药芯焊丝气保焊(FCAW)在加氢反应器接管内壁不锈钢堆焊中的应用[J].金属加工(热加工),2009(12):25-28.
[10]郭保平,朱敏,任世宏,等.焊后热处理对双相不锈钢带极堆焊层组织性能的影响[J].石油化工设备,2013,42(8):50-53.Guo Baoping,Zhu Min,Ren Shihong,et al.Influence of post weld heat treatment to duplex stainless steels overlaying layer[J].PetroChemical Equipment,2013,42(8):50-53.
[11]俄馨,史伟,他进国,等.退火对2209双相不锈钢堆焊层组织和性能的影响[J].金属热处理,2015,40(6):138-141.E Xin,Shi Wei,Ta Jinguo,et al.Influence of annealing on microstructure and mechanical properties of 2209 duplex stainless steel surfacing layer[J].Heat Treatment of Metals,2015,40(6):138-141.
[12]陈嘉砚,杨卓越,杨武,等.双相不锈钢中σ相的形成特点及其对性能的影响[J].钢铁研究学报,2006,18(8):1-4.Chen Jiayan,Yang Zhuoyue,Yang Wu,et al.Characteristic of phaseσprecipitation and its effects on behavior in duplex stainless steel[J].Journal of Iron and Steel Research,2006,18(8):1-4.
[13]Ramirez A J,Lippold J C,Brandi S D.The relationship between chromium nitride and secondary austenite precipitation in duplex stainless steels[J].Metallurgical and Materials Transactions A,2003,34(8):1575-1597.
[14]Lippold J C,Kotecki D J.不锈钢焊接冶金学及焊接性[M].陈剑虹,译.北京:机械工业出版社,2008.