QI Hai-quan
,
YONG Qi-long
钢铁研究学报(英文版)
According to the formation energy of CuS and Cu2S and the solubility formulae of elements Cu and S in ferrite and in austenite, the solubility product formulae of CuS and Cu2S in ferrite and in austenite have been obtained as log[Cu][S]=6.15-5643.78/T , log[Cu][S]=6.15-5643.78/T,log[Cu][S]=6.007-5620.3/T (in ferrite and austenite), and log[Cu]2[S]=6.62-9693.75/T and[Cu]2[S]=6.143-9048.66/T (in ferrite and austenite), respectively, which can be used in concerned research work.
关键词:
CuS;Cu2S;solubility product;ferrite;austenite
LIU Yu-rong
,
YE Dong
,
YONG Qi-long
,
SU Jie
,
ZHAO Kun-yu
,
JIANG Wen
钢铁研究学报(英文版)
The microstructures and mechanical properties of Cr13 super martensitic stainless steel after different heat treatments were studied. The results show that the structures of the steel after quenching are of lath martensite mixed with a small amount of retained austenite. With the raising quenching temperature, the original austenite grain size increases and the lath martensite gradually becomes thicker. The structures of the tempered steel are mixtures of tempered martensite and reversed austenite dispersed in the martensite matrix. The amount of reversed austenite is from 754% to 2249%. After different heat treatments, the tensile strength, the elongation and the HRC hardness of the steel are in the range of 813-1070 MPa, 101%-212% and 2133-3237, respectively. The steel displays the best comprehensive mechanical properties after the sample is quenched at 1050 ℃ followed by tempering at 650 ℃.
关键词:
super martensitic stainless steel
,
quenching
,
tempering
,
structure
,
property
,
reversed austenite
