Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol-Nitinol Joints

被引：8
|
作者：
Rehman, Ateekh Ur [1 ]
Babu, Nagumothu Kishore [2 ]
Talari, Mahesh Kumar [2 ]
Usmani, Yusuf Siraj [1 ]
Al-Khalefah, Hisham [3 ]
机构：
[1] King Saud Univ, Coll Engn, Dept Ind Engn, Riyadh, Saudi Arabia
[2] Natl Inst Technol, Dept Met & Mat Engn, Warangal, Andhra Pradesh, India
[3] King Saud Univ, Adv Mfg Inst, Riyadh, Saudi Arabia
来源：
FRONTIERS IN MATERIALS | 2021年 / 8卷
关键词：
rotary friction welding; nitinol alloy; phase transformation; hardness; tensile properties; MEMORY; BEHAVIOR; PHASE;
D O I：
10.3389/fmats.2021.726383
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present study, a rotary friction process was used to join nitinol in a similar welding combination. Macro- and microstructure characteristics of the weld zone were compared with adjacent zones and the base metal. The hardness and tensile properties of the joints were evaluated, and the results were discussed in relation to the weld microstructure. The weld macrostructure revealed a uniform flash around the circumference of the weld. The optical microstructure of the welded sample revealed fine recrystallized grains at the weld interface due to heavy deformation followed by dynamic recrystallization. The phase transformation behavior of the base metal and welded samples was studied by using a differential scanning calorimeter (DSC). The drift in phase transformation temperatures after rotary friction welding may be attributed to fine grain formation at the weld interface. Friction welded samples exhibited improved yield strength and hardness values compared to the base metal due to grain refinement at the weld interface.
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页数：9
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