易切削铌钒复合微合金中碳钢的研究  

FREE-CUTTING Nb-V COMBINED MICROALLOYED MEDIUM CARBON STEEL

作　　者：蔡爱国[1] 王瑞珍[1] 庞干云[1] 章洪涛[1] 

机构地区：[1]钢铁研究总院

出　　处：《钢铁》1995年第S1期80-84,61,共6页Iron and Steel

摘　　要：本文介绍了工业试制易切削铌钒复合微合金中碳钢３５ＭｎＶＮｂＳ。结果表明，增加硫含量（０．０３％～０．１％）对钢的强度和塑性没有明显的影响，而冲击韧性值有上升趋势。铁素体和珠光体节的的平均尺寸相对减小。钢水经钙处理后球化夹杂物体积占总夹杂物体积４０％～５０％。此类夹杂物不仅有利于力学性能各向同性，而且有利于切削加工性能，比调质钢４０Ｃｒ优越得多。The industrially trial-produced free-cutting Nb-V microalloyed medium carbon steel was investigated.Experimental results show that strength and plasticity are not obviously influenced by sulphur addition in the range of 0.03%～0.1%,Impact toughness value does not decrease and shows some increase instead.The average size of ferrite grains and pearlitic nodules reduces wit h in-creasing Scontent.40～50 percent of sulphide inclusions is modified by Ca treatment.The modified oxysulphide inclusions benifit not only mechanical properties but also machinability;Testing results of machinability prove that machinabilityof steel 35M nVNbS is much better than that of quenched and tempered steel 40Cr.

关 键 词：易切削 铌钒复合微合金化 中碳钢 

分 类 号：TG146.41[一般工业技术—材料科学与工程]