Effect of Heat Input on the Microstructural, Mechanical, and Corrosion Properties of Dissimilar Weldment of Conventional Austenitic Stainless Steel and Low-Nickel Stainless Steel

Vipin Tandon,Ravindra V Taiwade,Himanshu Vashishtha,Manish A Thombre,Awanikumar P Patil

doi:10.1007/s13632-020-00681-y

Abstract

In the present investigation, an attempt has been made to investigate the replacement compatibility of conventional austenitic stainless steel (316L) with low-Ni austenitic stainless steel (201) by employing their dissimilar welding using gas tungsten arc welding technique with varying heat input. The effects of heat input on the microstructural, mechanical, and corrosion properties were studied. The result depicts the balanced austenite/ferrite content in the fusion zone for both the heat inputs. The low heat input process, which results in a faster cooling rate, demonstrates higher tensile strength and microhardness. Similarly, the pitting corrosion resistance of the fusion zone demonstrates better properties on the low heat input process attributed to the lesser dendritic length and lesser interdendritic arm spacing.

Highlights

Austenitic stainless steels (SSs) are extensively consumed material in industries owing to their good mechanical and corrosion properties [1, 2]
The following conclusions can be drawn: (i) The skeletal and lathy ferrite was formed in a fusion zone of the low heat input weldment
The increase in heat input reduced the formation of lathy ferrite, and only, skeletal ferrite was formed in high heat input fusion zone

Summary

Introduction

Austenitic stainless steels (SSs) are extensively consumed material in industries owing to their good mechanical and corrosion properties [1, 2]. Fusion welding is a mostly used technique to join the austenitic SSs. Fusion welding of dissimilar metals or alloys is always challenging due to differences in composition, physical, and thermal properties as it is associated with many defects such as solidification cracking, porosities, and microsegregation [8]. Moslemi et al [11] examined the effect of current on the gas metal arc-welded 316L austenitic SS They concluded that high current input weld possesses superior mechanical properties. Verma et al [14] performed the dissimilar welding of 316L austenitic SS with 2205 duplex SS with varying heat input They reported that high heat input weldment depicted better mechanical and corrosion properties than low heat input weldment. Prabakaran et al [15] conducted the laser welding process of 316L austenitic SS with 1080 low carbon steel and optimized the laser welding process for the better mechanical properties

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Conclusion