TA2/Q235复合板用Ni基过渡层熔焊接头组织和性能
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摘要
采用Ni基过渡填充材料,进行TA2/Q235复合板对接熔化焊试验,研究了接头组织形貌、成分分布、相组成及力学性能.结果表明,近焊缝区,TA2覆层组织主要是板条α相,Q235基层组织为块状珠光体和铁素体;焊缝中Ti层组织主要为呈树枝晶生长的β相,并含有NiTi_2,Ni_3Ti,TiFe,TiFe_2和TiCr_2相,Ni基层中主要是γ-Ni,并含有少量Fe_3Ni_2,CrNi_2和(CrNiMo)化合物,Ti层与Ni基层之间存在宽约50μm过渡层,过渡层中存在大量针叶状NiTi_2,NiTi金属间化合物,被CrNi_2相包覆,从Ti层到Ni基层,Ti元素缓慢下降,Ni元素先升高后降低,Cr,Mo元素波动升高;Ti层及与Ni基焊缝的过渡层中的金属间化合物和脆性相,提高了硬度,降低了塑韧性.
Fusion welding of TA2/Q235 composite plate was carried out by taking Ni alloy as filled material.The microstructure,chemical,phase composition and mechanical properties of the weld metal were investigated.Results showed that the microstructure of TA2 coating was mainly lath α-phase and microstructure of Q235 matrix was massive pearlite and ferrite near the weld zone.In the weld,microstructure of Ti layer was mainly a dendritic growth of β-phase,containing NiTi_2,Ni_3Ti,TiFe,TiFe_2 and TiCr_2.Microstructure of Ni alloy layer was mainly γ-Ni,and contained a small amount of Fe_3Ni_2,CrNi_2 and(CrNiMo) compounds.Between Ti layer and Ni layer,there was a transition layer width of 50 μm,and a lot of needle were in the transition layer such as NiTi_2 and NiTi intermetallic compound coated by CrNi_2 phase.From the Ti layer to the Ni alloy layer,element Ti decreased slowly,Ni increased first and then decreased and Cr,Mo element increased slowly.The intermetallic and brittle phases in the Ti layer and the transition layer increased the hardness and reduced the ductility.
Fusion welding of TA2/Q235 composite plate was carried out by taking Ni alloy as filled material.The microstructure,chemical,phase composition and mechanical properties of the weld metal were investigated.Results showed that the microstructure of TA2 coating was mainly lath α-phase and microstructure of Q235 matrix was massive pearlite and ferrite near the weld zone.In the weld,microstructure of Ti layer was mainly a dendritic growth of β-phase,containing NiTi_2,Ni_3Ti,TiFe,TiFe_2 and TiCr_2.Microstructure of Ni alloy layer was mainly γ-Ni,and contained a small amount of Fe_3Ni_2,CrNi_2 and(CrNiMo) compounds.Between Ti layer and Ni layer,there was a transition layer width of 50 μm,and a lot of needle were in the transition layer such as NiTi_2 and NiTi intermetallic compound coated by CrNi_2 phase.From the Ti layer to the Ni alloy layer,element Ti decreased slowly,Ni increased first and then decreased and Cr,Mo element increased slowly.The intermetallic and brittle phases in the Ti layer and the transition layer increased the hardness and reduced the ductility.
引文
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[2]陈满乾,刘亚芬.TA2/Q235B钛钢复合板的焊接[J].焊接,2007(8):53-55.Chen Manqian,Liu Yafen.Welding of TA2/Q235B titanium steel composite plate[J].Welding&Joining,2007(8):53-55.
[3]Kundu S,Ghosh M,Laik A,et al.Diffusion bonding of commercially pure titanium to 304 stainless steel by using copper interlayer[J].Materials Science and Engineering A,2005,407(1-2):154-160.
[4]孙荣禄,杨文杰,于斌,等.钛合金与不锈钢扩散焊中间金属的选择[J].宇航材料工艺,1997(5):15-18.Sun Ronglu,Yang Wenjie,Yu Bin,et al.Selection of intermediate metals for diffusion welding of titanium alloy and stainless steel[J].Aerospace Materials&Technology,1997(5):15-18.
[5]Kundu S,Sam S,Mishra B,et al.Diffusion bonding of microduplex stainless steel and Ti alloy with and without interlayer:interface microstructure and strength properties[J].Metallurgical and Materials Transactions A,2014,45(1):371-383.
[6]孙荣禄,李慕勤,张九海,等.中间过渡金属对钛合金与不锈钢扩散焊接头强度的影响[J].焊接学报,1996,27(4):212-218.Sun Ronglu,Li Muqin,Zhang Jiuhai,et al.Effect of intermediate transition metal on the strength of titanium alloy and stainless steel diffusion welded joints[J].Transactions of the China Welding Institution,1996,27(4):212-218.
[7]孙玮.氩弧焊接TA2及Ti62421s合金组织、性能的研究[D].长沙:中南大学,2012.
[8]王敬忠,颜学柏,阎静亚,等.钛-钢复合板生产中的过渡层材料[J].有色金属工程,2009,61(4):39-42.Wang Jingzhong,Yan Xuebai,Yan Jingya,et al.Transition layer materials in the production of titanium-steel composite sheets[J].Nonferrous Metals Engineering,2009,61(4):39-42.
[9]吴伟刚,张敏,丁旭,等.TA1/X80复合板用TiNi/NiCrMo双过渡层熔焊对接接头组织及性能[J].材料研究学报,2016(5):372-378.Wu Weigang,Zhang Min,Ding Xu,et al.Microstructure and properties of butt joints of TiNi/NiCrMo double transition layer welded joints for TA1/X80 composite sheets[J].Chinese Journal of Materials Research,2016(5):372-378.
[10]Qin B,Sheng G M,Huang J W,et al.Phase transformation diffusion bonding of titanium alloy with stainless steel[J].Materials Characterization,2006,56(1):32-38.
[11]Okamoto H.Cr-Ti(chromium-titanium)[J].Journal of Phase Equilibria,2002,23(4):382.
[12]葛鹏,吴欢,赵永庆.Mo、V、Cr对钛合金β相的合金化效应[J].中国材料进展,2016,35(10):795-798.Ge Peng,Wu Huan,Zhao Yongqing.Alloying effect of Mo,Vand Cr onβphase of titanium alloy[J].Materials China,2016,35(10):795-798.