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Effect of High Temperature Service on Microstructure and Properties of HP40Nb Furnace Tube Joint(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

Issue:
2020年第2期
Page:
133-137
Research Field:
Publishing date:

Info

Title:
Effect of High Temperature Service on Microstructure and Properties of HP40Nb Furnace Tube Joint
Author(s):
LI Songlin1CAO Luowei2HAN Zhiyuan2CHENG Fangjie13
(1.School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China) (2.China Special Equipment Inspection and Research Institute, Beijing 100029, China) (3.Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China)
Keywords:
HP40Nb welded joints high temperature service microstructure mechanical properties
CLC:

PACS:
TG407
DOI:
10.7502/j.issn.1674-3962.201905005
DocumentCode:

Abstract:
In this paper, the effects of high temperature service process on the microstructure and mechanical properties of welded joints were studied in a section of HP40Nb hydrogen reformer tubes that have been in service for about 7 years. The characteristics of microstructure and the morphology and distribution of precipitated phases in different regions were observed and analyzed. The properties such as hardness, strength and impact toughness of each region were determined. The results showed that only a small amount of carbides were precipitated out from the deposited metal, lots of carbides were precipitated in the base metal and aggregated on the austenite grain boundary to form a network chain; the tensile strength of the joints only declined a little, but its elongation and impact toughness had been seriously reduced.

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Last Update: 2020-03-23