Effect of copper addition on the fracture and fatigue crack growth behavior of solution heat-treated SUS 304H austenitic steel

Title
Effect of copper addition on the fracture and fatigue crack growth behavior of solution heat-treated SUS 304H austenitic steel
Authors
K.K. Alaneme홍성민Indrani Sen에릭플러리Ramamurty
Keywords
Ferrous alloy; Fatigue; Fracture; Martensitic transformation; Electron microscopy
Issue Date
2010-07
Publisher
Materials science & engineering. A, Structural materials : properties, microstructure and processing
Citation
VOL 527, NO 18-19, 4600-4604
Abstract
Small additions of Cu to the SUS 304H, a high temperature austenitic stainless steel, enhance its high temperature strength and creep resistance. As Cu is known to cause embrittlement, the effect of Cu on room temperature mechanical properties that include fracture toughness and fatigue crack threshold of as-solutionized SUS 304H steel were investigated in this work. Experimental results show a linear reduction in yield and ultimate strengths with Cu addition of up to 5 wt.% while ductility drops markedly for 5 wt.% Cu alloy. However, the fracture toughness and the threshold stress intensity factor range for fatigue crack initiation were found to be nearly invariant with Cu addition. This is because the fracture in this alloy is controlled by the debonding from the matrix of chromium carbide precipitates, as evident from fractography. Cu, on the other hand, remains either in solution or as nano-precipitates and hence does not influence the fracture characteristics. It is concluded that small additions of Cu to 304H will not have adverse effects on its fracture and fatigue behavior.
URI
http://pubs.kist.re.kr/handle/201004/37791
ISSN
0921-5093
Appears in Collections:
KIST Publication > Article
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