CAJ | 학술논문

研究了H13钢在电渣锭退火、锻后退火和淬回火三种状态下的析出物特征。利用碳膜萃取复型,通过透射电镜、电子衍射和能谱分析发现方形、圆形及尺寸在200 nm以下的不规则碳化析出物,并确定它们分别为 V8 C7、Cr23 C6和 Cr3 C2( Cr2 VC2)。研究了这些析出物的演变规律,并对其在液相区、固-液两相区和固相区的析出规律进行了热力学计算。根据热力学计算及电子衍射标定结果发现,Cr23 C6和V8 C7在液相区及固-液两相区均不能析出,当冷却到固相区时它们才开始析出。
연구료H13강재전사정퇴화、단후퇴화화쉬회화삼충상태하적석출물특정。이용탄막췌취복형,통과투사전경、전자연사화능보분석발현방형、원형급척촌재200 nm이하적불규칙탄화석출물,병학정타문분별위 V8 C7、Cr23 C6화 Cr3 C2( Cr2 VC2)。연구료저사석출물적연변규률,병대기재액상구、고-액량상구화고상구적석출규률진행료열역학계산。근거열역학계산급전자연사표정결과발현,Cr23 C6화V8 C7재액상구급고-액량상구균불능석출,당냉각도고상구시타문재개시석출。
The characteristics of precipitates in H13 steel under three different states, i. e. , annealed electroslag remelting ( ESR) , annealing and tempering, were studied by means of carbon extraction replica technique, transmission electron microscopy, electron diffraction and energy dispersive spectroscopy. It is observed that these precipitates is composed of square-shaped ones, round-shaped ones and irregular ones below 200 nm in size, which are defined as V8 C7 , Cr23 C6 and Cr3 C2 ( Cr2 VC2 ) , respectively. The evo-lution of these precipitates was analyzed, and thermodynamic calculations of precipitation were performed in the liquid phase region, the liquid-solid phase region and the solid phase region. Thermodynamic calculation and transmission electron microscopy results show that Cr23 C6 and V8 C7 cannot precipitate in both the liquid phase region and the liquid-solid phase region, but they start to precipitate only when cooling to the solid phase.