Effect of Solution Annealing on the Microstructure and Mechanical Properties of Modified 440A Martensitic Stainless Steel

Published on Aug 31, 2013in Power System Engineering
· DOI :10.9726/KSPSE.2013.17.4.103
Young-Chul Kim , Soon-Doo Kwon + 1 AuthorsChang-Yong Kang1
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Abstract
Abstract: This study was investigated the effect of austenitizing treatment the microstructure and mechanical properties in modified 440A steel, and the results were as follows. The amount of remaining carbide decreases with increasing the austenitizing treatment temperature, and all carbide is completely dissolved at 1250℃. The amount of remaining carbide decreases with increasing the austenitizing treatment time, but the carbide remains insoluble up to 120 minutes at 1050℃. The strength and hardness gradually decrease with increasing the austenitizing treatment temperature and is significantly lower at 1250℃, while the elongation and the impact value rapidly increase. The strength and hardness rapidly decrease, the elongation and impact value rapidly insrease with increasing the austenitizing treatment time and exhibit no change at above 120 minutes. The austenitizing treatment modified 440A steel is required for temperature of above 1050℃ and time of above 60 minutes. Key Words :Martensitic stainless steel, Austenitizing, Strength, Impact value, Carbide
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#1최병철H-Index: 1
#2김영권H-Index: 1
Last. 김화남H-Index: 1
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The purpose of this study is to investigate the best melting condition with various winding number of a heating pipe, supplying quantity of engine coolant and coolant temperature at the inlet of the heating pipe. Also, it is to suggest getting method of an appropriate quantity of the agent for the urea-SCR system within 10 minutes. For this matter, this study identifies the temperature distribution of inside of urea-tank while it is frozen at the low temperature condition, and suggests the best ...
#1Y.C. Kim (Pukyong National University)H-Index: 1
#2Byong-Ho Jung (Pukyong National University)H-Index: 1
Last. Chang-Yong Kang (Pukyong National University)H-Index: 1
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440A martensitic stainless steels which were modified with reduced carbon content(~0.5%) and addition of small amount of nickel, vanadium, tungsten and molybdenum were manufactured. Effects of alloying elements and tempering temperatures on the uniform corrosion in the solution of lN H2S04 were investigated through the electrochemical polarization test. When tempering temperature is constant, corrosion current density in active-passive transition point, Icorr, decreased a little with an increase...
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#1S ChaudhuriH-Index: 1
Over a few decades various means of retarding or preven-ting corrosion of iron and steel products have been extensively used. These include painting or coating with metals or sometimes nonmetals that proved helpful in inhibiting corrosion in specific environments to which the products would be subjected. However, paintings or coatings have limited life. They require periodic repl-acement to prevent corrosion which will eventually take place.
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