压水堆驱动机构钩爪激光与GTAW钴基合金堆焊层组织分析及性能表征

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Abstract The control rod drive mechanism (CRDM ) is only active component in reactor system, involving structural mechanics, electromagnetics, fluid mechanics, heat transfer, and automatic control. The shape of the latch arms is complex and precise, the latch arms is the motion actuator in primary circuit of the pressurized water reactor (PWR), the cladding layer of pin hole and the ministry of latch arms tooth is welded by the cobalt alloy, so the microstructure and properties of the cladding layer have a great influence on the CRDM. In order to get the appropriate process parameters that meet the design requirements, we carried out the GTA welding and laser welding process test. In addition, we carried out the microstructure characterization and analysis of the cladding layer that welded by the cobalt alloy. We also have compared with the macro and micro morphology of the cladding layer that welded by GTA welding and laser welding, and tested the micro hardness of the cladding layer. The element Co, Cr, Fe of the cladding layer have been tested by the line scanning. The hardness of the two different cladding layer is relation to the dilution rate through the analysis distribution of element Fe. No microscopic cracks, the inclusion, air hole, fusion and other defects were observed in two different cladding layer. Because of the fine grain strengthening, the grain is the most fine in the cladding layer of laser welding. The micro hardness is also the highest in the cladding layer of laser welding

Key words： control rod drive mechanism latch arms Co-base alloy GTA welding laser beam welding dendrite microhardness dilution rate

Published: 05 July 2019

CLC number:

TG455

About author:: Baochao Guo, graduated at Shandong University in 2009, is currently an engineer and director of special process subsection of Shanghai No.1 Machine Tool Works Co., Ltd. He has published more than 10 papers, applied 5 national invention patents and 2 of them were authorized. He participated 3 national science and technology great special projects and is in charge of RPVI or CRDM welding technology of several nuclear po-wer projects, such as AP1000, CAP1400, Hua Long I’ High Temperature Reactor. His research interests focus on high power beam welding process, welding deformation control, and additive manufacturing of main equipment of nuclear island.En Jiang, a senior engineer and director of technology dept. of Shanghai No.1 Machine Tool Works Co., Ltd., published more than 10 papers, applied more than 10 patents and 5 of them were authorized. He managed several national science and technology great special projects, participated manufacturing and technical work of almost all series of Chinese PWR (from 300 MW to 1 000 MW), EPR, HTR and so on, is in charge RVI and CRDM manufacturing technology of AP1000, CAP1400 and Hua Long I, and design of several nuclear island mechanical equipment in demonstration project of 600 MW fast neutron reactor. His research interests focus on precision machining, welding, assembly and mea-suring of great components of main equipment of nuclear island.

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Cite this article:

GUO Baochao,JIANG En,CHEN Liang. Microstructure Analysis and Property Characterization of Laser and GTAW Co-base Alloy Cladding Layer of PWR CRDM Latch Arms[J]. Materials Reports, 2019, 33(z1): 416-419.

URL:

http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2019/V33/Iz1/416