碳当量对铸态高强度球墨铸铁残余应力的影响.pdfVIP

学兔兔 铸 造 Apr．2014 · ： l2 · FOUNDRY VO1．63 NO．4 碳当量对铸态高强度球墨铸铁残余应力的影响 卫东海，李克锐，吴现龙，赵怀普，李 桐 (郑州机械研究所，河南郑州450001) 摘要：浇 不 碳 的球攀铸铁心力征铸件，通过金相榆验和矗孔法洲应力研究r球铁的残余应力随碳 变化 的鼬律 结 太叫：碳、 j瞳的增加有利于降低铁液的过冷温度，获得数量较多且均匀分 的球状石攀，减小缩松倾 …和心 J策IIj；1 0％Mn一0．5％Cu 合处 使球铁的基体完全珠比俸化，提高_r组织均匀性，有利于降低残余 力， 坪彳『高的抗批嵌度和硬度；球铁的残余心力随符碳当量的增『Jl】 减小趋势，CE从3．94％增加到4．59％Bq，最大 心 和托心 分别从一188．0 MPa和119．5 MPa降至一76．9 MPa和53．7 MPa，分别降低了59％和55％。 关键词：碳当量；铸态球墨铸铁；应力框；残余应力；显微组织 中图分类号：TG255 文献标识码：A 文章编号：1001—4977(2014)04—0312—05 Effect of Carbon Equivalent on Residual Stress of High Strength As—Cast Ductile I ron WEI Dong—hai，LI Ke—rui，WU Xian—long，ZHAO Huai—pu，LI Tong (Zhengzhou Research Institute of Mechanical Engineering，Zhengzhou 45000 1，Henan，China) Abstract：Ductile iron stress frames with different carbon equivalent(CE)were poured．By metallographic test and measuring residual stress with blind hole method．the variation ofresidual stress in ductile iron with CE was studied。The results show that the increase Of CE benefits for reducing subcooled．temperature and achieving more graphite nodule that distributes uniformly,then reducing shrinkage and stress concentration．Ductile iron with 1．O％Mn一0．5％Cu compound treatment has nearly l 00％ pearlite．which iS beneficia1 for improving microstructure uniformity,tensile strength．hardness and reducing residual stress．Residual stress of ductile iron decreases with the increase of CE．When CE increases from 3．94％ to 4．59