固溶时间对UNS N10276焊管组织和性能的影响

Effects of solid solution time on microstructure and properties of the UNS N10276 welded tube

以冷轧态带卷,经TIG焊制备的规格为Φ50.8 mm×1.5 mm的UNS N10276焊管为试验材料,在1150℃对其进行8~30 min的固溶处理,通过光学显微镜、电子万能试验机和显微维氏硬度计等对固溶处理后的UNS N10276焊管组织和性能进行表征。结果表明,焊管的强度和硬度随着固溶时间的增加,先下降后上升,然后再下降;焊管的晶间腐蚀速率随固溶时间的增加先减小后增加。经固溶处理15 min时,焊管组织会发生再结晶,此时焊管的强度和HV硬度最高,分别为1021 MPa和276;晶间腐蚀速率最小,为1.744 mm/a。采用1150℃,保温15 min的固溶处理工艺,可获得综合性能良好的UNS N10276焊管。

A UNS N10276 welded tube with a size of 50.8 mm×1.5 mm prepared by cold-rolled coil through cold bending and nonmelting TIG welding was used as the raw material.It was subjected to solid-solution treatment at 1150℃for 8~30 min.The microstructure and properties of the solution-treated UNS N10276 welded tube were characterized by optical microscopy,electronic universal testing machines and micro Vickers hardness tests.The results showed that with increasing solution time,the strength and hardness of the welded tube first decreased,then increased,and finally decreased.The intergranular corrosion rate of the welded pipe first decreased and then increased with increasing solution time.When the solution time was15 min,the structure of the welded pipe recrystallized.At this time,the strength and hardness of the welded pipe were the highest,which were 1021 MPa and 276 HV1,respectively.The intergranular corrosion rate of the welded tube was the lowest,only 1.744 mm/a.A UNS N10276 welded tube with good comprehensive properties could be obtained by solution treatment at 1150℃for 15 min.