TRANSITION-METAL JOINTS FOR STEAM-GENERATORS - AN OVERVIEW

被引：111

作者：

BHADURI, AK

VENKADESAN, S

RODRIGUEZ, P

MUKUNDA, PG

机构：

[1] Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam

[2] Department of Metallurgical Engineering, Indian Institute of Technology, Kharagpur

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 1994年 / 58卷 / 03期

关键词：

Failure (mechanical) - Joints (structural components) - Service life - Steel - Transition metals - Welds;

D O I：

10.1016/0308-0161(94)90061-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The transition metal joint (TMJ) between an austenitic stainless steel and a chromium-molybdenum (Cr-Mo) ferritic steel used widely in steam generators of power plants has for a long time presented problems relating to premature failures in service. The direct (bimetallic) TMJ presently in use is designed for a service life of about 200,000 h; but such TMJs with iron-base weld metals have been failing in service within about one-third of their design lifetime, while their counterparts with nickel-base weld metals fail within about one-half of their design lifetime. The causes for such premature service failures of these TMJs are discussed in detail, leading to the development of improved TMJs. One of the improved TMJs with a trimetallic configuration of austenitic stainless steel/Alloy 800/Cr-Mo ferritic steel is discussed in detail, covering its development, characterisation and evaluation. Accelerated performance tests in the laboratory have indicated a four-fold improvement in the service life of the TMJ with this trimetallic configuration compared to the bimetallic configuration. The metallurgical details of these studies are also discussed in this paper.

引用

页码：251 / 265

页数：15

共 79 条

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