Microstructural analysis and the influence of shot peening on stress corrosion cracking resistance of duplex stainless steel welded joints

155-167This paper aims to study the weldment of duplex stainless steel (DSS) AISI 2205. Tungsten inert gas (TIG) welding is performed with controlled welding parameters. The effect of cooling rate on microstructural changes is analyzed by varying the heat input during welding. The results show that high heat input and excessive nickel content in the filler wire, leads to excessive formation of austenite phases in the fusion zone. Lower heat input nucleates lesser amount of austenite phases and also very low heat input causes lack of fusion in the weld joints. Microstructural variations due to welding are assessed by conducting the micro hardness test, impact toughness test and tensile test. To study the effect of shot peening, the samples are prepared from the DSS welded plate. The chloride induced stress corrosion cracking (SCC) test is conducted and the result shows a noticeable improvement in the corrosion resistance of the weld zone due to shot peening. The findings of this study can be used in marine applications. </span

Weldability, machinability and surfacing of commercial duplex stainless steel AISI2205 for marine applications – A recent review

In the present review, attempts have been made to analyze the metallurgical, mechanical, and corrosion properties of commercial marine alloy duplex stainless steel AISI 2205 with special reference to its weldability, machinability, and surfacing. In the first part, effects of various fusion and solid-state welding processes on joining DSS 2205 with similar and dissimilar metals are addressed. Microstructural changes during the weld cooling cycle such as austenite reformation, partitioning of alloying elements, HAZ transformations, and the intermetallic precipitations are analyzed and compared with the different welding techniques. In the second part, machinability of DSS 2205 is compared with the commercial ASS grades in order to justify the quality of machining. In the third part, the importance of surface quality in a marine exposure is emphasized and the enhancement of surface properties through peening techniques is highlighted. The research gaps and inferences highlighted in this review will be more useful for the fabrications involved in the marine applications