本文選題：H模具鋼　切入點：初生碳氮化物　出處：《工程科學學報》2017年05期 　論文類型：期刊論文

【摘要】：利用光學顯微鏡、掃描電鏡和電子探針研究了H13鋼中初生碳氮化物高溫分解時的形貌、尺寸、成分變化規(guī)律.原始初生碳氮化物主要為10~30μm的長條狀(V_x,Mo_(1-x))(C_y,N_(1-y))及少量方形的(Ti_x,V_(1-x))(C_y,N_(1-y)).在1200℃保溫2.5 h后碳氮化物邊緣變?yōu)榘纪共黄降匿忼X狀,然后形成細小的分解顆粒,10 h后碳氮化物平均長度減小為12.9μm,主要為(Ti_x,V_(1-x))(C_y,N_(1-y)).當經(jīng)過1250℃×5 h保溫后87%的碳氮化物發(fā)生分解,(V_x,Mo_(1-x))(C_y,N_(1-y))溶解消失,碳氮化物長度在20μm以下,當保溫時間延長到10 h后碳氮化物長度均在10μm以下,70%為方形并且93%分解形成細小顆粒,未分解的碳氮化物為(Ti_x,V_(1-x))(C_y,N_(1-y)).電子探針分析(Ti_x,V_(1-x))(C_y,N_(1-y))的分解與Fe元素擴散有關,高溫時Fe在(Ti_x,V_(1-x))(C_y,N_(1-y))中含量逐漸增加而Ti、V減少,優(yōu)先在邊部曲率半徑較小部位或缺陷處分解,形成0.1~1μm的細小分解顆粒,并由外向內以區(qū)域溶解方式使原始碳氮化物逐漸消失.雙亞點陣模型分析兩種碳氮化物的平衡溶解溫度和組成有關,試樣中大部分(Ti_x,V_(1-x))(C_y,N_(1-y))平衡溶解溫度在1200~1246℃之間,與實驗吻合較好.
[Abstract]:The morphology and size of primary carbonitride in H13 steel were studied by optical microscope, scanning electron microscope and electron probe. Composition change regularity. The original primary carbonitride is mainly 10 ~ 30 渭 m long stripe. After being kept at 1200 鈩，

本文編號：1612122