Prevention of Sensitization and Fracture Analysis of Keyhole Plasma Arc Welded AISI 304 HCu Tube Joints

被引：1
作者：
Jones, P. G. Sam Infant [1 ]
Rajakumar, S. [1 ]
Kavitha, S. [1 ,2 ]
Balasubramanian, V. [1 ]
机构：
[1] Annamalai Univ, Fac Engn & Technol, Dept Mfg Engn, Chidambaram, Tamil Nadu, India
[2] Annamalai Univ, Fac Engn & Technol, Dept Elect & Instrumentat Engn, Chidambaram, Tamil Nadu, India
来源：
JOURNAL OF FAILURE ANALYSIS AND PREVENTION | 2023年 / 23卷 / 04期
关键词：
Austenite; Plasma; Dendrites; Mechanical property; Microstructure; Corrosion; GAS TUNGSTEN ARC; AUSTENITIC STAINLESS-STEEL; STRAIN-HARDENING BEHAVIOR; HOT TENSILE PROPERTIES; MICROSTRUCTURE; GTAW;
D O I：
10.1007/s11668-023-01691-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Reheaters and superheaters of the Advanced Ultra Supercritical (AUSC) Boilers prefer AISI304 HCu. The steels are prone to sensitization on welding (550 to 900 & DEG;C), segregation of alloying elements, and wider bead profiles, resulting in the degradation of joint properties. Plasma Arc Welding by keyhole mode (KPAW) provided a better solution by autogenously joining 9 mm thick tube joints in a single pass. The KPAW joint has minimum bead geometry compared to Tungsten Inert Gas (TIG) welds. The strength of the KPAW joints (610 MPa) is 17% higher than the TIG joints (502 MPa) and close to the strength of the base material. The homogenous morphology of the KPAW joint with fine dendrites of & delta;-ferrite enhances the properties of welded joints. The cooling rate influences the finer nucleation of dendrites with minimal arm spacing of 12.4 & mu;m per unit area. The estimated cooling rate for the KPAW joint is around 0.97 x 10(5) K/s, which results in an average dendritic length of 69 & mu;m.
引用
收藏
页码：1538 / 1549
页数：12
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