摘要
奥氏体 FeCr18.2Ni6.9Mo2.5C1.5合金时效时可产生明显的二次硬化效果。在时效过程中除有M_(23)C_6碳化物沉淀析出外,还有体心相形成。经差热分析、x 射线衍射分析和电子衍射分析证明该体心楣为加热过程中形成的铁素体,但往往会被误认为二次淬火时形成的马氏体。高温硬度试验证明二次硬化效果是由 M_(23)C_6碳化物形成引起的。
Austeinitic FeCr18.2Ni6.9Mo205C1.5 alloy can produce an obvious age hardening effect.Besides precipitation of M_(23)C_6 carbide the formation of body-center phases takes place buring aging process.Differential thermal aualysis (DTA),X-ray diffraction analysis and electron microscope study show that the body centered phase is ferrite forming on heating.But it is usually misunderstood as martensite forming during secondary quenching.The results of the hardness test prove the effect ot secondary hardening in cau- sed by forming M_(23)C_6 carbides.
关键词
二次硬化
高碳高合金钢
机制
Fe—Cr—Ni—Mo—c alloy
secondary hardening
ferrite
M_(23)C_6 carbide
