Microstructure evolution in heat affected zone of T4003 ferritic stainless steel

2015 ◽  
Vol 68 ◽  
pp. 114-120 ◽  
Author(s):  
Zhaohan Zhang ◽  
Zhibin Wang ◽  
Wenxian Wang ◽  
Zhifeng Yan ◽  
Peng Dong ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Microstructure Evolution ◽  
Heat Affected Zone

Microstructural evolution and properties of tungsten inert gas and fiber laser welded SUS445 ferritic stainless steel

2021 ◽  
Vol 112 (9) ◽  
pp. 687-694
Author(s):  
Ching-Wen Lu ◽  
Huei-Sen Wang ◽  
Chih-Chun Hsieh ◽  
Jie-Jyun Wu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Fiber Laser ◽  
Ferritic Stainless Steel ◽  
Heat Affected Zone ◽  
Volume Fraction ◽  
Inert Gas ◽  
Laves Phases ◽  
Welding Processes

Abstract To determine the weldability of SUS445 ferritic stainless steel, two welding approaches, tungsten inert gas and fiber laser welding processes, were used and compared. After the welding processes, the microstructure, mechanical properties, and corrosion resistance of the welds were investigated. In the weld fusion zones of these two welding approaches, different morphologies of the grains were obtained. No obvious precipitation formed in these zones. In the heat affected zone of the tungsten inert gas welds, more volume fraction and larger grain sizes of the Laves phase and larger matrix grains were observed, which significantly affected its corrosion resistance and mechanical properties. However, in the heat affected zone of the fiber laser welds, only small amounts Laves phases and a relatively narrow matrix grain growth area were observed, which offers better corrosion resistance and mechanical properties.

scholarly journals Exploratory Study of Sensitization in Cryogenically Cooled Ferritic Stainless Steel Welds

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
M. O. H. Amuda ◽  
S. Mridha
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Heat Affected Zone ◽  
Cryogenic Liquid ◽  
Cryogenic Cooling ◽  
Martensite Content ◽  
Steel Grades ◽  
Single Grain ◽  
Steel Welds ◽  
Aisi 430

Enhanced cooling via forced convection using cryogenic liquid is an option for controlling grain growth in the heat affected zone (HAZ) of ferritic stainless steel welds which improves joint strength. However, this technique seems to alter the martensite distribution in the high-temperature heat affected zone (HTHAZ) which is a critical constituent in rating the susceptibility to sensitization in ferritic stainless steel grades; any such information is not available in the literature. Thus, it is imperative to establish the influence of cryogenic cooling on sensitization dynamics in the HTHAZ. This paper discusses the influence of cryogenic cooling on sensitization in an AISI 430 ferritic stainless steel weld. It is established that cryogenic cooling increases the cooling rate in the HTHAZ and reduces the martensite volume percent by an average of 20%. This reduction in martensite content in the HTHAZ increases the level of ditched structure in cryogenically cooled welds and yields more ferrite-martensite ditched grain boundaries than in conventional welds. Although the cryotreated welds exhibit greater ditched boundary, the structure is still classified as nonsensitized, since no single grain boundary is completely surrounded by ditches.

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