Study on Microstructure and Properties of K438 Alloy TIG Welding Joint

LIU Baoxia; WANG Hongshun; PANG Yibin; WANG Xin; HUANG Zhaoliang; WANG Yan; ZHANG Feng; ZHANG Jihua

doi:10.7512/j.issn.1001-2303.2024.03.23

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Study on Microstructure and Properties of K438 Alloy TIG Welding Joint
Vol. 54, Issue 3, Pages: 152-157(2024)
Published： 25 March 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.03.23

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刘保侠，王红顺，庞义斌，等.镍基焊丝氩弧焊K438合金接头组织与性能研究［J］.电焊机，2024，54（3）：152-157.

LIU Baoxia, WANG Hongshun, PANG Yibin, et al.Study on Microstructure and Properties of K438 Alloy TIG Welding Joint[J].Electric Welding Machine, 2024, 54(3): 152-157.
刘保侠，王红顺，庞义斌，等.镍基焊丝氩弧焊K438合金接头组织与性能研究［J］.电焊机，2024，54（3）：152-157. DOI： 10.7512/j.issn.1001-2303.2024.03.23.

LIU Baoxia, WANG Hongshun, PANG Yibin, et al.Study on Microstructure and Properties of K438 Alloy TIG Welding Joint[J].Electric Welding Machine, 2024, 54(3): 152-157. DOI： 10.7512/j.issn.1001-2303.2024.03.23.

摘要

针对某型燃气轮机动力涡轮转子叶片磨损失效要求，通过钨极氩弧焊制备了无裂纹的K438接头，分析了K438接头的显微组织和力学性能。结果表明，接头成形美观、无裂纹，堆焊区组织中γ基固溶体上弥散分布着富Cr的柱状、颗粒状、树状等形态各异的M

和M

C白色相，结合线硬度达452 HV0.5，堆焊区硬度约278 HV0.5，接头平均抗拉强度403.3 MPa，接头断裂于堆焊区，断裂形式为脆性和韧性混合断裂。

Abstract

Aiming at the wear and failure requirements of a certain type of gas turbine power turbine rotor blade

a crack-free K438 joint was prepared by TIG welding

and the microstructure and mechanical properties of the K438 joint were analyzed. The results show that the joints are beautifully formed and have no defects such as cracks. The γ-based solid solution in the surfacing area is dispersed with Cr-rich M

and M

C white phases such as columnar

granular and dendritic phases. Furthermore

the bonding line hardness is as high as 452 HV0.5

the hardness of the surfacing area is about 278 HV0.5. In addition

the average tensile strength of the joint is 403.3 MPa

and it is fractured in the surfacing area in the mode of brittle and ductile fracture.

关键词

K438合金钨极氩弧焊显微组织力学性能

Keywords

K438 alloynickel based welding wireTIGmicrostructuremechanical properties

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