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- 저자 : 마르켈로프(V. Markelov) (검색결과 1 건)
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항복강도에 따른 Zr-2.5Nb 압력관의 Delayed Hydride Cracking Velocity
김영석(Kim Young Suk),정용무(Cheong Yong Moo),임경수(Im Kyung Soo),김인섭(Kim In Sup),마르켈로프(V. Markelov) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
The objective of this study is to investigate the delayed hydride cracking velocity (DHCV) of Zr-2.5Nb pressure tubes with yield strength. DHC tests were conducted at an initial K₁ of 19 ㎫√m and 250℃ on the compact tension specimens containing 100 ppm hydrogen that were taken from the Zr-2.5Nb tubes with different yield strengths. The crack growth was determined with the direct current potential drop method. A nice correlation of the DHC velocity and the yield strength was obtained at all temperatures by normalizing the DHCV with the terminal solid solubility and diffusion of hydrogen: the DHCV increased exponentially with increased yield strength of the Zr-2.5Nb tubes. In contrast, the texture and the distribution of the β-Zr phase were found to have a comparatively minor effect on the DHCV of the Zr-2.5Nb tubes. Yield strength of the Zr-2.5Nb tubes determines a plastic zone size with a steep gradient of hydrogen concentration ahead of the crack tip where hydrides can be precipitated. The yield strength effect is discussed by correlating the plastic and the striation spacing observed on the fractured surfaces as a function of yield strengths.
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