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Evaluation of thermal aging embrittlement of austenitic stainless steels JN1, JJ1, and JK2 by cryogenic small-punch testing

Published online by Cambridge University Press:  31 January 2011

Maribel L. Saucedo-Muñoz ,
Shi Cheng Liu ,
Shin-Ichi Komazaki ,
Il-Hyun Kwon ,
Toshiyuki Hashida ,
Hideaki Takahashi  and
Hideo Nakajima
Maribel L. Saucedo-Muñoz*
Affiliation:
Fracture Research Institute, Tohoku University, Aoba-Ku, Sendai 980–8579, Japan and Instituto Politecnico Nacional, ESIQIE, Apartado Postal 75–556, Mexico, D.F. 07300
Shi Cheng Liu
Affiliation:
Department of Materials Engineering, Dalian Railway Institute, Dalian 116022, China
Shin-Ichi Komazaki
Affiliation:
Muroran Institute of Technology, 27–1 Mizumotocho, Muroran, Hokkaido 050–8585, Japan
Il-Hyun Kwon
Affiliation:
Department of Precision Mechanical Engineering, Chonbuk National University, Chonbuk, Korea
Toshiyuki Hashida
Affiliation:
Fracture Research Institute, Thohku University, Aoba-Ku, Sendai 980–8579, Japan
Hideaki Takahashi
Affiliation:
Fracture Research Institute, Thohku University, Aoba-Ku, Sendai 980–8579, Japan
Hideo Nakajima
Affiliation:
Japan Atomic Energy Research Institute, Mukaiyama, Nakamichi, Naka-gun, Ibaraki-ken 311–02, Japan
*
a)Address all correspondence to this author.maribels@webtelmex.net.mx
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Abstract

Small-punch tests were conducted at 4, 77, and 293 K on three newly developed cryogenic austenitic stainless steels, JN1, JJ1, and JK2, which were solution treated, water-quenched, and then aged at 923, 973, 1023, and 1073 K for 5 h. Small-punch test energy was employed for the evaluation of the aging-induced embrittlement behavior in these materials. An SEM analysis of the fracture surface for the solution-treated steel specimens indicated a ductile fracture, having the highest SP test energy values. On the contrary, intergranular brittle fracture was observed in aged specimens. The small-punch test energy of materials decreased significantly as the aging process progressed. The highest and lowest decrease in small-punch test energy with aging temperature occurred in JN1 and JK2 steels, respectively. The decrease in small-punch test energy was shown to follow appropriately the aging-induced embrittlement in these materials. The difference in aging-induced embrittlement behavior for these steels was explained on the basis of the volume fraction of intergranular precipitates in aged samples.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 4 , April 2002 , pp. 852 - 860
Copyright
Copyright © Materials Research Society 2002

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