林勇传,黄健友,谢正良,韦珏宇.发动机特殊材质蠕墨铸铁RuT400的研发与应用[J].内燃机工程,2017,38(6):86-91.
发动机特殊材质蠕墨铸铁RuT400的研发与应用
Development and Application of Vermicular Graphite Cast Iron RuT400 for Engines
DOI：
关键词:内燃机  蠕墨铸铁  发动机材料  氮化硼  自润滑
Key Words:vermicular graphite cast iron  engine material  BN  self-lubrication
基金项目:广西区自然科学基金项目（2014GXNSFAA118347）；玉林市广西大学市校科技合作资助项目（玉市校科合201402801）
作者单位
林勇传,黄健友,谢正良,韦珏宇 1.广西大学 机械工程学院,南宁 530004；2.玉柴工程研究院,南宁 530012 
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摘要:为了解决新型发动机材料RuT400应用过程中加工困难的问题，对蠕墨铸铁进行了氮化硼（BN）微量添加试验，然后通过金相试验、拉伸试验、硬度试验和摩擦试验分析了BN对蠕墨铸铁的金相组织和力学性能的影响。试验结果表明：BN对蠕墨铸铁的石墨、珠光体和铁素体的形态和含量均不会产生影响；BN对蠕墨铸铁的抗拉强度和硬度的影响甚微，但是对蠕墨铸铁的摩擦性能影响较大；当BN含量为0.0144%时，蠕墨铸铁的耐磨性能最佳；BN能有效降低蠕墨铸铁车削加工的表面粗糙度，并且使其加工过程更加稳定。因此，在不破坏蠕墨铸铁力学性能的基础上，通过添加微量BN使其产生自润滑功能，从而改善其加工性能是可行的。
Abstract:In order to solve the processing difficulty of a new vermicular graphite cast iron RuT400 used in engines, the addition experiment of micro boron nitride(BN) on vermicular graphite cast iron was carried out, and the microstructure and mechanical properties of graphite cast iron were analyzed by means of metallographic test, tensile test, hardness test and friction test. Experimental results show that BN has no influence on the morphology and content of graphite, pearlite and ferrite, and has little effect on the tensile 〖JP2〗strength and hardness, but has a great influence on the friction properties. When the content of BN is 0.0144%, the wearing resistance is the best. BN can effectively reduce the surface roughness of vermicular graphite cast iron in turning, and it would make the process more stable. Therefore, it is feasible to improve the process ability by adding micro BN to produce self lubrication function without affecting the mechanical properties of vermicular graphite cast iron.
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