Does ADI Microstructure contain bainite?
Does ADI Microstructure contain bainite?
(OP)
Hi all,
I read in some journals that bainite occurs within the second stage of austempering (unwanted), and that the wanted microstructure is austenite and ferrite (ausferrite).
In some other journals it said that adi contains bainite.
I thought it contains bainitic ferrite and austenite, and decomposes to ferrite and carbides when austempered too long.
Does anyone know what the the proper microstructure of austempered ductile iron should be?
Thanks in advance
I read in some journals that bainite occurs within the second stage of austempering (unwanted), and that the wanted microstructure is austenite and ferrite (ausferrite).
In some other journals it said that adi contains bainite.
I thought it contains bainitic ferrite and austenite, and decomposes to ferrite and carbides when austempered too long.
Does anyone know what the the proper microstructure of austempered ductile iron should be?
Thanks in advance





RE: Does ADI Microstructure contain bainite?
RE: Does ADI Microstructure contain bainite?
RE: Does ADI Microstructure contain bainite?
The preponderance of information on the austempering of steel and the superficial similarities between the austempering heat treatments applied to steels and ADI, have resulted in comparisons which are incorrect and damaging to the understanding of the structure and properties of ADI. ADI is sometimes referred to as "bainitic Ductile Iron", but correctly heat treated ADI contains little or no bainite. Bainite consists of a matrix of acicular (plate-like) ferrite and carbide. ADI’s ausferrite matrix is a mix of acicular ferrite and carbon stabilized austenite. This ausferrite may resemble bainite metallographically, however it is not because it contains few or none of the fine carbides characteristic in bainite. An ausferrite matrix will only convert to bainite if it is over tempered.
RE: Does ADI Microstructure contain bainite?
RE: Does ADI Microstructure contain bainite?
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RE: Does ADI Microstructure contain bainite?
thanx,
construct2
RE: Does ADI Microstructure contain bainite?
DI Design Engineers Digest
Down load page 10 and 11
http://www.ductile.org/dimg/downloads.html
http://www.sorelmetal.com/en/ductile/main_family.htm
http://www.ductile.org/index.html
RE: Does ADI Microstructure contain bainite?
Mat Sci Eng A 346 (2003) 273-286
Mat Sci Eng A 194 (1995) 87-98
Mat Sci Eng A 268 (1999) 15-31
Scripta Mat Vol 38, No. 8, pp. 1281-1287, 1998
Scripta Met Mat Vol 32, No. 9, pp. 1363-1367, 1995