A MECHANISTIC STUDY OF TRANSGRANULAR STRESS-CORROSION CRACKING OF TYPE 304 STAINLESS-STEEL

被引：47

作者：

JANI, S ^{[1
]}

MAREK, M ^{[1
]}

HOCHMAN, RF ^{[1
]}

MELETIS, EI ^{[1
]}

机构：

[1] LOUISIANA STATE UNIV,DEPT MECH ENGN,MAT ENGN PROGRAM,BATON ROUGE,LA 70803

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1991年 / 22卷 / 06期

关键词：

D O I：

10.1007/BF02660677

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Transmission electron microscopy (TEM) was utilized to characterize the deformation substructure of 304 stainless steel tested for transgranular stress corrosion cracking (TGSCC) in 45 wt pct MgCl2 at 155-degrees-C. The TEM characterization was conducted in thin foils prepared from the fracture surface and from a series of known depths below the fracture surface. The results indicate that the stacking fault energy (SFE) of the material immediately ahead of the crack tip is lowered, with the deformation mode at small distances (a few microns) in front of the growing crack front being entirely coplanar while at larger distances homogeneous. The reduction in the SFE is attributed to absorbed hydrogen formed during the cathodic reaction. Based on this and previous observations of transgranular stress corrosion characteristics of austenitic stainless steels in chloride environments, a "hydrogen-induced cleavage" model is proposed. This model is essentially a modification of a model based on enhanced structural reactivity associated with Lomer-Cottrell locks proposed by Robertson and Tetelmann in 1962.

引用

页码：1453 / 1461

页数：9

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