The fatigue crack initiation at the interface between matrix and δ-ferrite in 304L stainless steel.pdf
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The fatigue crack initiation at the interface between matrix and δ-ferrite in 304L stainless steel
THE FATIGUE CRACK INITIATION AT THE INTERFACE
BETWEEN MATRIX AND d-FERRITE IN 304L STAINLESS
STEEL
Byung Sup Rho, Hyun Uk Hong and Soo Woo Nam*
Department of Materials Science and Engineering, Korea Advanced Institute of Science and
Technology, 373-1 Kusong-dong Yusong-gu, Taejon, 305-701, Korea
(Received July 10, 1998)
(Accepted July 27, 1998)
Introduction
It is well known that austenitic stainless steels have good mechanical properties and good corrosion
resistance at high temperatures and are widely used in high temperature application. However,
representative 304L stainless steel among austenitic stainless steels has the undesirable d-ferrite in g
matrix unavoidably because of the limitation of the manufacturing process (1). While large amounts of
d-ferrite in the austenitic stainless steels can give rise to a decrease in the hot workability (2), the
absence of d-ferrite in 304L stainless steel can be the cause of longitudinal facial crack and shortness
of continuous cast slab (3,4). However, there are few reported papers related with the effect of d-ferrite
nucleating the initial crack at the interface between matrix and d-ferrite on fatigue properties at high
temperature.
In the present work, a comparison of fatigue life with the amount of d-ferrite was examined, and to
find out the mechanism of crack initiation caused by d-ferrite, dislocation behavior near the interface
between d-ferrite and matrix during fatigue testing was analyzed. To analyze the dislocation character
near the interface between the matrix and d-ferrite during a low cycle fatigue test, trace analysis was
applied (5). Using Burgers vector and dislocation line direction, calculated by trace analysis, it was
possible to obtain some characteristic of dislocation behaviors near the interface.
Experimental
The chemical composition of as-received 304L stainless steel investigated is shown in Table 1. In order
to control the amount of d-ferrite, solution treatment at 1050°C for 1hr which can lead
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