Atom probe field ion microscopy of type 308 CRE stainless steel welds
- Oak Ridge National Lab., TN (United States). Metals and Ceramic Div.
Additions of controlled residual elements (CRE) such as titanium, boron and phosphorus, to the commercial 308 type stainless steel welds have been found to improve the creep-rupture properties. In both conventional and CRE-type stainless steel welds, during high temperature service, various microstructural changes take place such as the formation of M{sub 23}C{sub 6} carbide networks along austenite({gamma})-ferrite ({delta}) interface, the formation of sigma ({sigma}) phase, and the dissolution of ferrite. Boron-containing CRE welds exhibit similar microstructural evolution as that of conventional types 308 stainless steel welds. As boron may segregate to ferrite-austenite interface and thereby modify the austenite-M{sub 23}C{sub 6} carbide interface, the distribution of boron was measured with an atom probe field ion microscope. Atom probe analysis revealed significant boron and carbon enrichments along the ferrite-austenite boundary in the as-welded state. The ratio of carbon to boron concentration at the interface was found to be {approximately} 4.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10183663
- Report Number(s):
- CONF-9407132-1; ON: DE94019162; TRN: 94:020179
- Resource Relation:
- Conference: International field emission symposium,Rouen (France),15-17 Jul 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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