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AISI 304 스테인리스강 용접부의 응력부식 균열에 미치는 질소함량의 영향
이언종,권소인 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.10
The effect of nitrogen content on the susceptibity for stress corrosion cracking of AISI 304 weld metal in holing 42% MgCl₂ have been investigated using the slow strain rate technique. As the nitrogen content in weld metal increased the amount of retained delta ferrite was decreased And it was found that the nitrogen content has more effects than the amount of retained delta ferrite on the mechanical properties of weld metal. The increase in nitrogen content promoted the planar arrays of dislocations. This behavior, together with the strip step dissolution, could explain the increased tendency of transgranular stress corrosion cracking with the increased nitrogen content and decreased initial strain rate.
초음파법에 의한 중탄소강에서의 시멘타이트 구상화율 평가
변재원,김준수,박은수,권소인 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.5
An attempt was made to evaluate the change of microstructures and mechanical properties with increasing spheroidizing time in a cold heading steel, containing proeutectoid ferrite and pearlite, by the ultrasonic attenuation and velocity measurements. Ultrasonic velocity was not sensitive to the microstructural changes, resulting from spheroidization heat treatment to produce various mean aspect ratio, mean equivalent size and number of cementite particles per unit area and ferrite grain size. Ultrasonic attenuation was initially decreased and then increased with increasing spheroidizing time. A good correlation between ultrasonic attenuation coefficient and mechanical properties such as hardness and tensile strength was found.