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Microstructure of the heat‐affected zone in 17–4 PH stainless steel
Author(s) -
Bhaduri Arun Kumar,
Venkadesan Srinivasan
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901694
Subject(s) - martensite , heat affected zone , microstructure , welding , metallurgy , austenite , materials science , composite material
The microstructure of the heat‐affected zone (HAZ) in bead‐on‐plate welded 17–4 PH stainless steel was studied with special reference to the roles of prior heat treatment and heat input during welding. The HAZ in solution‐annealed condition consists of three different microstructural zones containing: (i) retransformed martensite and reformed austenite; (ii) overaged martensite; and (iii) under‐aged martensite. In aged condition the HAZ consists of zones (i) and (ii), while in overaged condition it consists almost entirely of zone (ii). The HAZ in solution‐annealed and aged conditions is characterised by steep gradients in hardness, while in overaged condition it has uniform hardness throughout. A good correlation was obtained between the calculated temperature distribution in the HAZ and the observed microstructural features.