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http://dx.doi.org/10.12656/jksht.2022.35.6.303

The Effects of the Structural Changes and Mechanical Properties of the Austenitized and Tempered Martensitic STS 410 Stainless Steel on Its Temper Embrittlement  

S.H., Lee (Metallurgical Chemistry Component Materials Engineering, Nambu University)
T.H., Go (Metallurgical Chemistry Component Materials Engineering, Nambu University)
W.S., Lee (Metallurgical Chemistry Component Materials Engineering, Nambu University)
S.D., Kim (Metallurgical Chemistry Component Materials Engineering, Nambu University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.35, no.6, 2022 , pp. 303-313 More about this Journal
Abstract
The purpose of this study was to test and analyze the effects of the mechanical properties and structural changes of the austenitized and tempered martensite STS 410 stainless steel containing 11.5~13%Cr and 0.10%C on its temper embrittlement. The STS 410 stainless steel test pieces for each 3 hours at 960℃, 1000℃ and then, tempered them for 2 hours at 300℃, 350℃, 400℃, 450℃, 500℃, 550℃, 600℃, 650℃ and 700℃ known as the intervals vulnerable to temper embrittlement to observe the changes of their structures and mechanical properties. In case autenitizing was insufficient due to lower temperature of thermal treatment for solution, unsolved carbides and ferrites remained in the structure after quenching, which meant that the parts could wear out and corrode to embrittle at the room temperature. Elongation and impact energy changes with Tempering conditions showed minimum results in range of 400~500℃. The decrease in elongation and impact energy at 400~500℃ was the hardening effect of the subgrain due to the precipitation of many M3C or M7C3, M23C6. And STS 410 stainless steel corrosion tested in 10% NaCl solution at 30℃ after tempering treatment. The degree of corrosion sensitization showed increasing tendency with increase of tempering temperature and Cr carbide precipitation were observed in grain boundary.
Keywords
Temper embrittlement; STS 410 stainless steel; Autenitizing; Structures and mechanical properties; Carbides; Impact energy; Corrosion;
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Times Cited By KSCI : 1  (Citation Analysis)
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