摘要
研究了铁素体(F)-奥氏体(A)双相不锈钢在600—1100℃范围内的力学性能,其韧性-温度曲线在800-900℃之间有一极小值。阐述了σ相析出动力学及其对材料力学性能的影响,σ相严重损害合金塑性,其影响程度随σ相含量的增加而增高,并与试验温度有极大的关系,1000℃时σ相对拉伸性能影响消失。
The mechanical properties of a ferritic-austenitic duplex stainless steel has been
investigated in the temperature range between 600 to 1100℃. The variation of ductility
against temperature has a minimum at 800--900℃. While at about 600℃ ferrite deformed
cooperatively with austenite. With increasing temperature the coordination decreased. Even
at 1100℃ ferrite dominated the deformation process. The kinetics of σ-phase precipitation
and the effect of σ-phase on tensile properties have also been revealed. The ductility of spec-
imens deformed at about 600℃ was largely reduced by σ-phase and the effects of σ-phase
increased with increasing σ-phase fraction but exhibit significant temperature dependence.
When a specimen consisting of 16% σ-phase was tested at 900℃, σ-phase particle bands
were realigned parallel to the shearinng directions. Final fracture was preceded by plastic
deformation. At about 1000℃ the effect of σ-phase precipitation on tensile properties disap-
peared, while fine dispersion of secondary austenite within ferrite strengthened the material
slightly.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第2期A079-A084,共6页
Acta Metallurgica Sinica
关键词
双相不锈钢
Σ相
力学性能
duplex stainless steel
σ-phase
mechanical property
