摘要
研究了填丝、板厚以及退火工艺对镍基合金(C-276)薄板焊缝组织和性能的影响,结果表明,自熔焊接条件下,随着板厚增加,焊缝区晶粒依次增大2μm,金相组织更均匀且沿一定方向分布,析出相由焊缝区移向热影响区,焊缝拉伸强度低于基体拉伸强度,断口形状不规则,断口均发生明显塑性变形,热影响区硬度最高,板厚对腐蚀性能没有明显影响;填丝后,焊缝区金相组织排列有序,形状规则,有大量析出相产生,焊缝区、热影响区晶粒增大5μm～10μm,焊缝区拉伸强度降低,硬度高于热影响区,耐腐蚀性能较自熔焊有所提高;固溶退火后,析出相减少,晶粒粗化并出现再结晶,再结晶晶粒焊缝区较结晶前晶粒减小2μm,热影响区晶粒增大15μm～20μm,焊缝区拉伸强度降低,但抗腐蚀性能明显提高。
The effect of filler wire,plate thickness and annealing process on the microstructure and properties of nickel based alloy（C-276） welding line were investigated.Results show that during autogenous welding,with the increase of thickness,the grain size within the welding seam area increase by 2μm in proper order with the metallographic structure become more even and distribute along certain direction.The precipitation phase move from welding area to heat affected zone;the tensile strength of the welding seam being lower than that of matrix;the shape of fracture being irregular;all fractures show trace of plastic deformation;the highest hardness appears at the heat affected zone.There was no obvious corresponding relation between the corrosion resistance and the thickness of the welding plate.After filler wire,the metallographic structure distribute orderly;the shape being regular;a large number of precipitation phase being produced;the grain size increase by 5μm～10μm;the tensile strength in welding zone decreases;the hardness in welding zone being higher than that in heat-affected zone;the corrosion resistance being better than that at autogenous welding.After solution annealing,the precipitated phase decrease;the grain being coarsened and recrystallized;the recrystallized grain size decrease by 2μm in welding zone and increase by 15μm～20μm in heat-affected zone than that before recrystallization;the tensile strength in welding zone decreases while the corrosion resistance increases significantly.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2011年第6期91-96,共6页
Journal of Plasticity Engineering
基金
国家重点研究发展计划资助项目(2009CB724300)
关键词
钨极氩弧焊
镍基合金
微观组织
腐蚀性能
GTAW
Ni-based alloy
metallographic structure
corrosive nature
