钒钛蠕墨铸铁的力学性能分析.pdfVIP

学兔兔 铸 造 Oct．2010 · 1076· FOUNDRY VOI．59 NO．1O 钒钛蠕墨铸铁的力学性能分析 李华基，洪观镇，杨志远 (重庆大学材料科学与工程学院，重庆400030) 摘要：以钒钛生铁为厚材料经蠕化处理后得到钒钛蠕墨铸铁。测试了钒钛蠕墨铸铁的力学性能，评估了其石墨形态和基 体组织，通过扫描电镜观察并分析了显徽组织和断口形貌。结果表明：钒钛蠕墨铸铁金相组织中蠕化率和基体中的珠光 体含量均较高，具有优良的常温力学性能，钒钛元素在蠕墨铸铁中以钒钛碳化物及固溶于渗碳体的形式存在，钒钛等合 金元素对蠕墨铸铁力学性能的影响有有利的一面，也有不利的一面，钒钛蠕墨铸铁拉伸试样最终呈韧．脆混合断裂。 关键词：蠕墨铸铁；钒钛；力学性能；显微组织；断口分析 中图分类号：TG143．49 文献标识码：A 文章编号：1001—4977(2010)l0—1076—04 Mechanical Properties of V-·Ti Verm icular Cast I ron Ll Hua-ji，HONG Guan-zhen。YANG Zhi．yuan (College of Materials Science and Engineering，Chongqing University，Chongqing 400030，China) Abstract：The V—Ti iron was used as raw materiaI and the V—Ti verm icular cast iron was acquired by vermicular treatment．The mechanicaI properties of V．Tj vermicular cast iron were tested；the graphite morphology and matrix structure were evaluated；the microscopic structure and fracture surface of the tension specimen were observed and analyzed bv SEM．The results show that V—Ti vermicular cast Iron has high vermicular graphite percentage and high content of pearlite。and owned good mechanicaI properties．V—Ti existed jn vermicular cast irorl in the fom1s Of、／_Ti carbide and V—Ti cementite．Alloying elements．such as V，Ti and SO on，have both favorable and URfavorable effects on vermicular cast iron．The tensile specimen V．Ti vermicular cast iron presented mixed ductile—brittle fracture finally． Key WOrds：vermicular cast iron；V—Ti；mechanicaI properties；microscopic structure；fracture analysis