TY - JOUR
T1 - Creep behavior of pack cementation aluminide coatings on Grade 91 ferritic-martensitic alloy
AU - Bates, B. L.
AU - Zhang, Y.
AU - Dryepondt, S.
AU - Pint, B. A.
PY - 2014/2/15
Y1 - 2014/2/15
N2 - The creep behavior of various pack cementation aluminide coatings on Grade 91 ferritic-martensitic steel was investigated at 650. °C in laboratory air. The coatings were fabricated in two temperature regimes, i.e., 650 or 700. °C (low temperature) and 1050. °C (high temperature), and consisted of a range of Al levels and thicknesses. For comparison, uncoated specimens heat-treated at 1050. °C to simulate the high temperature coating cycle also were included in the creep test. All coated specimens showed a reduction in creep resistance, with 16-51% decrease in rupture life compared to the as-received bare substrate alloy. However, the specimens heat-treated at 1050. °C exhibited the lowest creep resistance among all tested samples, with a surprisingly short rupture time of <. 25. h, much shorter than the specimen coated at 1050. °C. Factors responsible for the reduction in creep resistance of both coated and heat-treated specimens were discussed.
AB - The creep behavior of various pack cementation aluminide coatings on Grade 91 ferritic-martensitic steel was investigated at 650. °C in laboratory air. The coatings were fabricated in two temperature regimes, i.e., 650 or 700. °C (low temperature) and 1050. °C (high temperature), and consisted of a range of Al levels and thicknesses. For comparison, uncoated specimens heat-treated at 1050. °C to simulate the high temperature coating cycle also were included in the creep test. All coated specimens showed a reduction in creep resistance, with 16-51% decrease in rupture life compared to the as-received bare substrate alloy. However, the specimens heat-treated at 1050. °C exhibited the lowest creep resistance among all tested samples, with a surprisingly short rupture time of <. 25. h, much shorter than the specimen coated at 1050. °C. Factors responsible for the reduction in creep resistance of both coated and heat-treated specimens were discussed.
KW - Aluminide coatings
KW - Creep
KW - Ferritic-martensitic steel
KW - Hardness
KW - Pack cementation
UR - http://www.scopus.com/inward/record.url?scp=84894905927&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2013.12.008
DO - 10.1016/j.surfcoat.2013.12.008
M3 - Article
AN - SCOPUS:84894905927
SN - 0257-8972
VL - 240
SP - 32
EP - 39
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -