锌白铜搅拌摩擦焊接头显微组织与力学性能
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摘要
采用SKD61工具钢搅拌头对4mm厚BZn18-26锌白铜进行搅拌摩擦焊对接,并对接头微观组织和力学性能进行分析。研究结果表明:由于白铜的强度高、维氏硬度大,搅拌针发生严重磨损导致焊缝根部未焊透;母材为纤维状轧制组织,焊核区发生动态再结晶获得细化的等轴组织,热机影响区发生再结晶并存在变形组织,热影响区晶粒发生再结晶及长大;焊缝和热影响区的维氏硬度均比母材的低,且焊核区由于发生完全动态再结晶软化效应最明显;无缺陷接头拉伸断裂于焊核区,且断口为韧窝状韧性断裂。
BZn18-26 cupronickel alloy with 4 mm in thickness was friction stir welded using SKD61 tool steel pin tool.Microstructure and mechanical properties of the joints were studied. The results show that due to high strength and hardness of cupronickel alloy, severe wear is happened to the pin tool and lack of penetration is formed at the bottom of the weld. Fiber grains can be seen along the rolling direction of the base metal, while fine equiaxed grains are formed in the nugget zone by dynamic recrystallization. The grains in the thermo-mechanically affected zone are recrystallized and deformed grains also remain. Grains in the heat affected zone are recrystallized and grown. The hardness of weld and heat affected zone is lower than that of the base metal, and the lowest hardness region of the welded joint is in the nugget zone due to completely dynamic recrystallization. All the defect-free welded joints are fractured in the nugget zone with ductile fracture mode during the tensile test.
BZn18-26 cupronickel alloy with 4 mm in thickness was friction stir welded using SKD61 tool steel pin tool.Microstructure and mechanical properties of the joints were studied. The results show that due to high strength and hardness of cupronickel alloy, severe wear is happened to the pin tool and lack of penetration is formed at the bottom of the weld. Fiber grains can be seen along the rolling direction of the base metal, while fine equiaxed grains are formed in the nugget zone by dynamic recrystallization. The grains in the thermo-mechanically affected zone are recrystallized and deformed grains also remain. Grains in the heat affected zone are recrystallized and grown. The hardness of weld and heat affected zone is lower than that of the base metal, and the lowest hardness region of the welded joint is in the nugget zone due to completely dynamic recrystallization. All the defect-free welded joints are fractured in the nugget zone with ductile fracture mode during the tensile test.
引文
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[31]KANG M,YUN K C.Investigation for microstructure and hardness of welded zone of Cu-Ni alloy using W92-Ni-Fe sintering tool[J].Journal of Korean Powder Metallurgy Institute,2015,22(3):181-186.
[2]马得江,陆伟宏.BZn15-20锌白铜扁锭熔铸生产实践[J].铜业工程,2017(2):23-26.MA Dejiang,LU Weihong.The production practice of BZn15-20zinc argentan flat ingot casting[J].Copper Engineering,2017(2):23-26.
[3]KERANS W H.Welding handbook[M].7th ed.Miami:American Welding Society,1982:245-250.
[4]程晓翀.BFel0-1-1铁白铜管材对接接头焊接工艺评定试验[J].卷宗,2016,6(3):247.CHENG Xiaochong.Procedure evaluation on butt joint welding of BFel0-1-1 copper-nickel pipe[J].Juan Zong,2016,6(3):247.
[5]李莉,邓洪军.BFe10-1-1白铜焊接工艺的研究[J].沈阳工业大学学报,2007,29(1):32-34.LI Li,DENG Hongjun.Study on welding technology for BFe10-1-1 copper-nickel alloy[J].Journal of Shenyang University of Technology,2007,29(1):32-34.
[6]黄永宪,吕宗亮,万龙,等.钛/铝异质金属搅拌摩擦焊技术研究进展[J].航空学报,2018,39(11):6-17.HUANG Yongxian,LüZongliang,WAN Long,et al.Review of dissimilar friction stir welding between titanium and aluminum[J].Acta Aeronautica et Astronautica Sinica,2018,39(11):6-17.
[7]LEE W B,JUNG S B.The joint properties of copper by friction stir welding[J].Materials Letters,2004,58(6):1041-1046.
[8]SUN Y F,FUJII H.Investigation of the welding parameter dependent microstructure and mechanical properties of friction stir welded pure copper[J].Materials Science&Engineering A,2010,527(26):6879-6886.
[9]KHODAVERDIZADEH H,HEIDARZADEH A,SAEID T.Effect of tool pin profile on microstructure and mechanical properties of friction stir welded pure copper joints[J].Materials&Design,2013,45:265-270.
[10]MIRONOV S,INAGAKI K,SATO Y S,et al.Microstructural evolution of pure copper during friction-stir welding[J].Philosophical Magazine,2015,95(4):367-381.
[11]XIE Guangming,MA Zongyi,GENG Lin.Development of a fine-grained microstructure and the properties of a nugget zone in friction stir welded pure copper[J].Scripta Materialia,2007,57(2):73-76.
[12]CARTIGUEYEN S,MAHADEVAN K.Influence of rotational speed on the formation of friction stir processed zone in pure copper at low-heat input conditions[J].Journal of Manufacturing Processes,2015,18:124-130.
[13]MERAN C.The joint properties of brass plates by friction stir welding[J].Materials&Design,2006,27(9):719-726.
[14]MOGHADDAM M S,PARVIZI R,HADDAD-SABZEVAR M,et al.Microstructural and mechanical properties of friction stir welded Cu-30Zn brass alloy at various feed speeds:influence of stir bands[J].Materials&Design,2011,32(5):2749-2755.
[15]SUN Yufeng,XU N,FUJII H.The microstructure and mechanical properties of friction stir welded Cu-30Zn brass alloys[J].Materials Science&Engineering A,2014,589(1):228-234.
[16]XIE Guangming,MA Zongyi,GENG Lin.Effects of friction stir welding parameters on microstructures and mechanical properties of brass joints[J].Materials Transactions,2008,49(7):1698-1701.
[17]MIRONOV S,INAGAKI K,SATO Y S,et al.Development of grain structure during friction-stir welding of Cu-30Zn brass[J].Philosophical Magazine,2014,94(27):3137-3148.
[18]?AM G,MISTIKOGLU S,PAKDIL M.Microstructural and mechanical characterization of friction stir butt joint welded63%Cu-37%Zn Brass Plate[J].Welding Journal,2009,88(11):s225-s232.
[19]?AM G,SERINDA?H T,?AKAN A,et al.The effect of weld parameters on friction stir welding of brass plates[J].Materialwissenschaft Und Werkstofftechnik,2008,39(6):394-399.
[20]PARK H S,KIMURA T,MURAKAMI T,et al.Microstructures and mechanical properties of friction stir welds of 60%Cu-40%Zn copper alloy[J].Materials Science&Engineering A,2004,371(1):160-169.
[21]EMAMIKHAH A,ABBASI A,ATEFAT A,et al.Effect of tool pin profile on friction stir butt welding of high-zinc brass(CuZn40)[J].The International Journal of Advanced Manufacturing Technology,2014,71(1/2/3/4):81-90.
[22]XU N,UEJI R,FUJII H.Enhanced mechanical properties of70/30 brass joint by rapid cooling friction stir welding[J].Materials Science&Engineering A,2014,610(2):132-138.
[23]XIE Guangming,MA Zongyi,GENG Lin.Partial recrystallization in the nugget zone of friction stir welded dual-phase Cu-Zn alloy[J].Philosophical Magazine,2009,89(18):1505-1516.
[24]XU Nan,UEJI R,FUJII H.Enhanced mechanical properties of70/30 brass joint by multi-pass friction stir welding with rapid cooling[J].Science&Technology of Welding&Joining,2015,20(2):91-99.
[25]HEIDARZADEH A,JABBARI M,ESMAILY M.Prediction of grain size and mechanical properties in friction stir welded pure copper joints using a thermal model[J].The International Journal of Advanced Manufacturing Technology,2015,77(9/10/11/12):1819-1829.
[26]RIZI M S,KOKABI A H.Microstructure evolution and microhardness of friction stir welded cast aluminum bronze[J].Journal of Materials Processing Technology,2014,214(8):1524-1529.
[27]SU J,SWAMINATHAN S,MENON S K,et al.The effect of concurrent straining on phase transformations in NiAl bronze during the friction stir processing thermomechanical cycle[J].Metallurgical and Materials Transactions A,2011,42(8):2420-2430.
[28]SONG Qining,ZHENG Yugui,NI Dinrui,et al.Corrosion and cavitation erosion behaviors of friction stir processed Ni-Al bronze:Effect of processing parameters and position in the stirred zone[J].Corrosion,2014,70(3):261-270.
[29]SONG Qining,ZHENG Yugui,NI Dinrui,et al.Studies of the nobility of phases using scanning Kelvin probe microscopy and its relationship to corrosion behavior of Ni-Al bronze in chloride media[J].Corrosion Science,2015,92:95-103.
[30]SONG Qining,ZHENG Yugui,NI Dinrui,et al.Characterization of the corrosion product films formed on the as-cast and friction-stir processed Ni-Al bronze in a 3.5wt%NaCl solution[J].Corrosion,2015,71(5):606-614.
[31]KANG M,YUN K C.Investigation for microstructure and hardness of welded zone of Cu-Ni alloy using W92-Ni-Fe sintering tool[J].Journal of Korean Powder Metallurgy Institute,2015,22(3):181-186.