热模钢渗氮与30SiMn2MoVA镀铬性能比较  

Comparison of Nitrided Hot Work Tool Steel and Chromium Coated 30SiMn2MoVA

作　　者：付航涛 张津[1] 黄进峰[2] 连勇[1] 张程[2] 高文[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《中国表面工程》2015年第6期1-6,共6页China Surface Engineering

摘　　要：30SiMn2MoVA钢作为我国传统轻武器身管用钢,逐渐不能满足现代武器的要求,内膛镀铬处理带来的问题也急需解决。选用一种新研发的具有良好室温、高温和低温强韧性匹配的热模钢25Cr3Mo2NiSiWVNb,结合其合金元素种类,通过盐浴渗氮进行表面改性,并与30SiMn2MoVA镀铬进行比较。开展了30SiMn2MoVA镀铬和热模钢渗氮后组织形貌观察、硬度检测以及热模钢渗氮前后物相变化的分析,并针对身管储存要求及实际射击工况,对两种试样的耐蚀性和耐高温磨损性能进行比较。结果表明:热模钢渗氮后硬度高于镀铬层,在3.5%NaCl溶液中耐腐蚀性能与镀铬层相当,但是耐高温磨性能仍需要进一步提升。As one type of economic gun barrel steel, 30SiMn2MoVA, its high temperature strength is too low to meet the need of long life for modern weapon. The environment unfriendly issue of the modification of chroming at the inner of barrel for 30SiMn2MoVA is an urgent problem to be addressed. A new type of hot work tool steel 25Cr3Mo2NiSiWVNb with good combination of properties of elevated and lower temperature was used which as an alternative for 30SiMn2MoVA. The properties of chromium coating on 30SiMn2MoVA and nitrided layer on hot work tool steel were studied. Microstructure and phase analysis were made. Hardness and wear resistance were evaluated. According to the actual behavior for service of gun, corrosion resistance and wear resistance at high temperature of two samples were compared. The results show that surface hardness of nitrided steel is higher than that of the chromium coating on 30SiMn2MoVA, and the two ways of modification have the similar corrosion resistance in 3.5-NaCl solution. Wear resistance at high temperature of nitrided steel needs further study compared with the chromium coating.

关 键 词：30SiMn2MoVA 镀铬 热模钢 渗氮 磨损 

分 类 号：TG174.445[金属学及工艺—金属表面处理]