·724· 工程科学学报，第39卷，第5期 表31200℃高温后碳氨化物形貌比例变化 30 30 1=21.3um Table 3 Morphology changes of carbonitrides after being held at 1200C 15 % 22 形貌原始态1200℃×2.5h1200℃×5h1200℃×10h 30 18 长条形63 49 23 15 方形 9 16 27 46 12 10 经过1200℃×10h后碳氮化物以方形为主，此时43% 碳氨化物边缘发生分解（形貌如图4(c),在原始碳氮 化物周围形成细小的颗粒 <9.5 9.5- 14.5- 19.5- 24.5- >29.5 14.4 19.4 24.4 29.4 与1200℃高温处理相比，在1250℃高温下碳氨化 碳氮化物长度/μm 物形貌发生显著变化.1250℃保温5h后大部分原始 图3H13钢中碳氨化物的长度分布 碳氨化物发生分解、边缘形成“葡萄”状小颗粒，小颗 Fig.3 Size distribution of carbonitrides in H13 steel 粒尺寸在0.1~1m之间，由图4(d)~(f)可知碳氮 (c 20m 10m 10 um 10m 10m 10 图4高温处理时碳氨化物形貌变化.(a)原始态：(b)1200℃保温2.5h时边部锯齿化的碳氮化物：(c)1200℃保温5h时部分分解的碳 氨化物：(d)1250℃保温5h时部分分解的碳氮化物：(e)1250℃保温5h时完全分解的方形碳氯化物：()1250℃保温5h时完全分解的 长条形碳氨化物：(g)1250℃保温5h时未分解的碳氮化物：(h)1250℃保温15h时完全分解的碳氮化物：(i)1250℃保温15h时残留的 难分解碳氨化物 Fig.4 Carbonitrides morphology evolution after high-temperature treatment:(a)original shape;(b)sawtooth carbonitride after being held at 1200 C for 2.5h;(e)partially decomposed carbonitride after being held at 1200C for5h;(d)partially decomposed carbonitride after being held at 1250 C for 5h;(e)completely decomposed carbonitride of square shape after being held at 1250C for5h;(f)completely decomposed carbonitride of strip shape after being held at 1250C for5h;(g)undecomposed carbonitride after being held at 1250C for 5h;(h)completely decomposed carbon- itride after being held at 1250C for 15h;(i)retained carbonitride diffult to decompose after being held at 1250C for 15h工程科学学报,第 39 卷,第 5 期 图 3 H13 钢中碳氮化物的长度分布 Fig. 3 Size distribution of carbonitrides in H13 steel 表 3 1200 益高温后碳氮化物形貌比例变化 Table 3 Morphology changes of carbonitrides after being held at 1200 益 % 形貌 原始态 1200 益 伊 2郾 5 h 1200 益 伊 5 h 1200 益 伊 10 h 长条形 63 54 49 23 方形 9 16 27 46 经过 1200 益 伊 10 h 后碳氮化物以方形为主,此时 43% 碳氮化物边缘发生分解(形貌如图 4(c)),在原始碳氮 化物周围形成细小的颗粒. 与 1200 益高温处理相比,在 1250 益高温下碳氮化 物形貌发生显著变化. 1250 益 保温 5 h 后大部分原始 碳氮化物发生分解、边缘形成“葡萄冶状小颗粒,小颗 粒尺寸在 0郾 1 ~ 1 滋m 之间,由图 4( d) ~ ( f)可知碳氮 图 4 高温处理时碳氮化物形貌变化. (a) 原始态; (b) 1200 益保温 2郾 5 h 时边部锯齿化的碳氮化物; (c) 1200 益保温 5 h 时部分分解的碳 氮化物; (d) 1250 益保温 5 h 时部分分解的碳氮化物; (e) 1250 益保温 5 h 时完全分解的方形碳氮化物; (f) 1250 益保温 5 h 时完全分解的 长条形碳氮化物; (g) 1250 益保温 5 h 时未分解的碳氮化物; (h) 1250益保温 15 h 时完全分解的碳氮化物; (i) 1250 益保温 15 h 时残留的 难分解碳氮化物 Fig. 4 Carbonitrides morphology evolution after high鄄temperature treatment: (a) original shape; (b) sawtooth carbonitride after being held at 1200 益 for 2郾 5 h; (c) partially decomposed carbonitride after being held at 1200 益 for 5 h; (d) partially decomposed carbonitride after being held at 1250 益 for 5 h; (e) completely decomposed carbonitride of square shape after being held at 1250 益 for 5 h; ( f) completely decomposed carbonitride of strip shape after being held at 1250 益 for 5 h; (g) undecomposed carbonitride after being held at 1250 益 for 5 h; (h) completely decomposed carbon鄄 itride after being held at 1250 益 for 15 h; (i) retained carbonitride diffult to decompose after being held at 1250 益 for 15 h ·724·