Application of the small-punch test on the evaluation of cryogenic toughness of isothermally aged austenitic stainless steels

被引：12
作者：
Saucedo-Muñoz, ML
Komazaki, SI
Hashida, T
Shoji, T
López-Hirata, VM
机构：
[1] Tohoku Univ, Inst Invest Fractura, Sendai, Miyagi 980, Japan
[2] Inst Politecn Nacl, Mexico City 07051, DF, Mexico
[3] Inst Tecnol Mororan, Hokkaido 0508585, Japan
来源：
REVISTA DE METALURGIA | 2003年 / 39卷 / 05期
关键词：
small-punch test; fracture toughness; austenitic stainless steels;
D O I：
10.3989/revmetalm.2003.v39.i5.350
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Two types of austenitic stainless steels JJ1 and JN1 were isothermally aged at temperatures from 873 to 1173 K for 10 to 1000 min in order to study the microstructural evolution and its effect on fracture toughness at cryogenic temperatures. The Charpy V-Notch (CVN) and Small-Punch (SP)Testing methods were conducted at 77 K to evaluate the toughness of both solution treated and aged specimens. The fracture energy at 77 K determined for both methods showed a significant decrease with aging time for both steels. A linear correlation between the fracture energies of both methods was found. The intergranular precipitation of carbides and nitrides was responsible for the fracture toughness deterioration. The scanning electron microscope fractographs showed an intergranular brittle fracture and its fraction also increased with aging time and temperature. The presence of a more abundant intergranular precipitation resulted in a more rapid decrease in fracture toughness with aging time in JN1 steel due to its higher content of C and N, compared to that of JJ1 steel.
引用
收藏
页码：378 / 386
页数：9
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