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 lathα-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 ofβ-phase,containing NiTi2,Ni3Ti,TiFe,TiFe2 and TiCr2.Microstructure of Ni alloy layer was mainlyγ-Ni,and contained a small amount of Fe3Ni2,CrNi2 and(CrNiMo)compounds.Between Ti layer and Ni layer,there was a transition layer width of 50μm,and a lot of needle were in the transition layer such as NiTi2 and NiTi intermetallic compound coated by CrNi2 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.
作者
张亚运
魏金山
齐彦昌
马成勇
徐玉松
ZHANG Yayun;WEI Jinshan;QI Yanchang;MA Chengyong;XU Yusong(Department of Welding,Central Iron and Steel Research Institute,Beijing 100081,China;College of Material Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212000,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2019年第1期75-79,164,共6页
Transactions of The China Welding Institution
基金
国家"863"高科技资助项目(2015AA03A501)
关键词
钛钢复合板
组织特征
过渡层
元素分布
力学性能
TA2/Q235 composite plate
microstructure characteristics
interlayer
element distribution
mechanical property
