The effects of stabilizing and residual elements on toughness and corrosion resistance have been investgated for a series of 6mm to 12mm thick 19Cr-2Mo ferritic stainless steel weld metals, using 1.6mm diameter welding filler wires. The weldability was studied through the hot and cold cracking susceptibility of the weld metal.

The best welded impact toughness was achieved with a combination of niobium stabilization and less than 150ppm(C+N).

A niobium-stabilized steel weld metal of 12mm thickness to which 0.01% REM(rare earth metals) had been added exhibited excellent toughness in Charpy impact tests.

REM addition to weld metal improved both fracture toughness and pitting corrosion of weld metals, whereas alumium improved only fracture toughness in the weld metal.

Nitrogen in the weld metal was more influencial to the impact toughness but carbon was more influencial to the pitting corrosion in the conventional gas-tungsten-arc welding process.

The microstructure change in the weld metal was observed by electron microscopy. Multiple welding thermal cycles influenced the precipitation rate and dislocation density in the weld metal, therefore the mechanical and corrosion properties varied in the weld metal according to the welding conditions.

Subject
Materials, Metal surfaces, Welding, Wiring, Purity, Nitrogen, Pitting, Carbon, Corrosion resistance, Cold cracking, Ferritic stainless steel, Toughness, Weld metal
© 1981 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1981
Association for Materials Protection and Performance (AMPP)
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