近终形铸造热锻模具新材料及成形工艺  

New Material and Casting Technique of Cast Hot Work Die

作　　者：姜启川[1] 方建儒[1] 张瑞卿 

机构地区：[1]吉林大学材料科学与工程学院,长春市130025 [2]第一汽车集团公司铸造公司铸造模具设备厂,长春市130011

出　　处：《中国机械工程》2003年第5期433-435,共3页China Mechanical Engineering

基　　金：国家自然科学基金资助项目 ( 5 97710 0 3 ) ;国家计委产业化前期关键技术与成套设备研制开发项目 ( [1999] 3 17)

摘　　要：通过优化合金成分设计、合金化、孕育与变质处理 ,开发出了新型铸造热锻模具钢。该钢具有较高的强韧性和高温稳定性 ,其组织为板条马氏体和贝氏体的复合组织 ,板条间连续分布着许多薄膜状残余奥氏体。在回火过程中有细小的碳化物 V3C4 、Mo2 C弥散析出。采用特种砂 V法铸造工艺获得了良好表面精度和尺寸精度的铸造模具。与传统的锻钢模具相比 ,寿命提高了 40 %～ 1 0 0 % ,具有较高的热疲劳抗力 ,加工余量少 ,不用改锻 ,降低了成本 ,经济效益显著 ,应用前景广阔。A new cast hot work die(CHD) steel has been developed, through optimization of alloy composition design, alloying, inoculation and modification. Results show that CHD steel possesses good strength and toughness and high temperature stability. The microstructures are combined with lath martensite with high density dislocations, bainite, and retained austenite films which distributed at the lathed boundaries continuously. The fine carbides such as V 3C 4 and Mo 2C were precipitated dispersedly during tempering. The fine surface quality and dimensional accuracy cast hot work die was obtained by special sand V method casting technique. Compared with that of conventional forged steel, the life time of the die made of the new cast steel was increased by a factor of 40%-100%. This die has the following advantages: higher resistance to thermal fatigue, fewer machining allowance, no needing forging, higher economic benefit and wider application prospects.

关 键 词：近终形铸造 热锻模具 强韧性 Ⅴ法铸造 热疲劳 

分 类 号：TG315.2[金属学及工艺—金属压力加工] TG249.9