3Cr17NiMo耐蚀塑料模具钢碳化物溶解及析出规律  

Dissolution and precipitation law of carbides in 3Cr17NiMo corrosion-resistant plastic mold steel

作　　者：夏云峰 周仲成 雷晓娟 于慎军 Xia Yunfeng;Zhou Zhongcheng;Lei Xiaojuan;Yu Shenjun(Special Steel Division,Inner Mongolia North Heavy Industry Group Co.,Ltd.,Baotou Inner Mongolia 014033,China;Casting and Forging Branch,CITIC Heavy Industry Machinery Co.,Ltd.,Luoyang Henan 471000,China)

机构地区：[1]内蒙古北方重工业集团有限公司特钢事业部,内蒙古包头014033 [2]中信重工机械股份有限公司铸锻分公司,河南洛阳471000

出　　处：《金属热处理》2024年第5期40-46,共7页Heat Treatment of Metals

摘　　要：采用JMatPro模拟计算软件及试验研究相结合的方式,对3Cr17NiMo耐蚀塑料模具钢的碳化物溶解和析出规律进行了研究。经试验分析表明,3 Cr17NiMo钢经1140℃奥氏体化后,在740~1040℃范围内等温,碳化物均首先于奥氏体晶界以细棒状或针状析出,并随温度降低逐渐长大形成明显的网状结构,而没有球化析出的现象。该钢中网状碳化物一旦形成,极难溶解和消除,当固溶温度为1100℃时,针状或棒状分布的碳化物才明显减少,随着固溶时间的延长,奥氏体晶粒逐渐趋于等轴晶分布,晶粒尺寸开始粗化,当固溶时间达到10 h以上时,由于出现了再结晶现象,晶粒反而细化。经过1100℃保温20~30 h+1060℃保温3 h两次固溶处理,可有效改善3Cr17NiMo钢中网状碳化物形态,均匀组织,细化晶粒,获得良好的组织形貌。Dissolution and precipitation of carbides in 3Cr17NiMo corrosion-resistant plastic mold steel were studied by means of JMatPro simulation calculation software and experimental research.The experimental results show that when austenitized at 1140℃,the 3Cr17NiMo steel undergoes isothermal annealing within the range of 740-1040℃,the carbides first precipitate at austenite grain boundaries in the form of fine rods or needles,and gradually grow into obvious network structure as the temperature decreases,without any phenomenon of spheroidization precipitation.Once network carbides are formed in the steel,they are extremely difficult to dissolve and eliminate.When the solution temperature is 1100℃,the carbides distributed in needle or rod shape are significantly reduced.With the extension of solution time,the austenite grain gradually tends to be equiaxed grain distribution,and the grain begins to coarsen.When the solution time is more than 10 h,due to the phenomenon of recrystallization,the grains are refined instead.After double solution treatment at 1100℃for 20-30 h and 1060℃for 3 h,the morphology of network carbides in the 3Cr17NiMo steel can be effectively improved,and good microstructure with a uniform structure and refined grains is obtained.

关 键 词：塑料模具钢 碳化物 固溶 析出 球化 

分 类 号：TG142.45[一般工业技术—材料科学与工程]