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

页码：1538 / 1549

页数：12

共 34 条

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