Effect Of Filler Metal Under Different Tempering Temperature to Corrosion Properties of 420 Martensite Stainless Steel Weld Joint.

Satyabujangga, Nyoman Arya (2026) Effect Of Filler Metal Under Different Tempering Temperature to Corrosion Properties of 420 Martensite Stainless Steel Weld Joint. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Repair welding has become an economical alternative to replacing damaged martensitic stainless-steel turbine components. However, the combined influence of filler metal selection and post-weld tempering temperature on corrosion performance remains insufficiently understood. This study investigates the effect of ERNiCr-3 and ER410 filler metals combined with tempering temperatures of 588°C and 620°C on the corrosion properties of GTAW-welded AISI 420 martensitic stainless steel. Four welded mock-up specimens were fabricated using identical welding parameters, followed by tempering for one hour. Optical microscopy, SEM/EDS analysis, Vickers microhardness testing, and Potentiodynamic polarization tests in 3.5 wt.% NaCl solution were conducted to evaluate the electrochemical behavior of the weld metal and heat-affected zone (HAZ). The results demonstrate that ERNiCr-3 provided superior corrosion resistance at 588°C, whereas ER410 exhibited the best overall corrosion performance after tempering at 620°C. Tempering at 588°C, the weld area with ERNiCr-3 filler metal exhibited lower corrosion current density and corrosion rate than ER410 due to the formation of Ni-rich austenitic weld metal that promoted a stable passive film. Under this condition, the weldment exhibited only a slight increase in corrosion current density compared with the original base metal, indicating that the Ni-rich weld metal effectively maintained the corrosion resistance of the welded joint. In contrast, the ER410 weldment showed a reduction in corrosion current density and corrosion rate after tempering, which correlated with the formation of a more homogeneous tempered martensitic microstructure while maintaining nearly unchanged Fe–Cr chemistry across the weld.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Corrosion, Filler Metal, Heat Treatment, Welding,
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA467 Iron and Steel Corrosion and protection against corrosion T Technology > TJ Mechanical engineering and machinery T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment T Technology > TN Mining engineering. Metallurgy > TN879.6 Welding
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Nyoman Arya Santyabujangga
Date Deposited:	05 Aug 2026 02:48
Last Modified:	05 Aug 2026 02:48
URI:	http://repository.its.ac.id/id/eprint/143833

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