In order to study the mechanism of mid–temperature thermal aging embrittlement in cast austenite stainless steel (CASS), the mechanical properties and microstructure were investigated of CASS which was aged at 400 ℃for 104 h. The results show that, no change in the ferrite content (volume fraction) was detected. After long term aging, the magnetic permeability of the CASS declined, bt the nano–hardness of ferrite phases increased. The Charpy impact energy decreased rapidly and the impact fracture morphologies changed with aging time. Large number of α' particles precipitated homogeneously in the ferrite phases of the CASS aged for 104 h. α′ precipittion produced by spinodal decomposition in ferrite was considered to the primary mechanism of thermal aging in CASS at mid-temperature. G phases were also observed n some positions of ferrite after long term aging.
LI Shi-Lei
,
LI Shu-Xiao
,
YU Yan-Li
,
YU Xi-Shou
. EFFECT OF LONG TERM AGING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF CAST AUSTENITIC STAINLESS STEELS[J]. Acta Metall Sin, 2010
, 46(10)
: 1186
-1191
.
DOI: 10.3724/SP.J.1037.2010.00250
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