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铁素体对蠕墨铸铁力学性能和导热性的影响
Effects of Ferrite on the Mechanical Properties and Thermal Conductivity of Vermicular Graphite Cast Iron
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- DOI:
- 作者:
- 徐 卓 1 ，王桂权 1 ，刘仲礼 1 ，王明佳 1 ，陈 祥 2 ，马 聪 3 ，王志钦 3
XU Zhuo 1 , WANG Guiquan 1 , LIU Zhongli 1 , WANG Mingjia 1 , CHEN Xiang 2 , MA Cong 3 , WANG Zhiqin
- 作者单位:
- 1. 烟台大学 核装备与核工程学院，山东 烟台 264005；2. 清华大学 材料学院，北京 100084；3. 烟台美丰机械集团有限公 司，山东 烟台 265112
1. School of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, China; 2. School of Materials and Engineering, Tsinghua University, Beijing 100084, China; 3. Yantai Mefine Machine Group Co., Ltd., Yantai 265112, China
- 关键词:
- 蠕墨铸铁；铁素体比例；固溶强化；力学性能；导热系数
vermicular graphite cast iron; ferrite ratio; solution strengthening; mechanical properties; thermal conductivity
- 摘要:
- 蠕墨铸铁制动盘要求其材料兼具良好的力学性能和导热性以获得高的耐热疲劳和耐磨损性能。 本文通过改变蠕墨铸铁中 Sn 和 Mo 元素的含量， 研究了铁素体含量及其固溶强化程度对抗拉强度、 布氏硬度和导热系数的影响。实验结果表明， Sn 元素显著改变了蠕墨铸铁中铁素体与珠光体的比例，并具有明显的固溶强化效果。 Mo 元素同样具有固溶强化效果，但对铁素体含量影响较小。 铁素体含量及其固溶强化程度对蠕墨铸铁力学性能和导热性的影响是互为矛盾的关系，因此提高铁素体含量的同时，通过固溶强化可以调控蠕墨铸铁的力学性能和导热性能以实现二者的平衡。Vermicular graphite cast iron used in brake discs demands a combination of improved mechanical properties and thermal conductivity to meet the requirements of high thermal fatigue and wear resistance. This study investigates the effects of the content and solution strengthening of ferrite on the tensile strength, Brinell hardness and thermal conductivity of vermicular graphite cast iron by changing the addition of Sn and Mo. The experimental results demonstrate that Sn significantly affects the proportion of pearlite and ferrite and strengthens the matrix of vermicular graphite cast iron. On the other hand, Mo can also strengthen the matrix but has less effect on the ratio of ferrite to pearlite. A contradictory relationship between the effects of ferrite (both its content and solution strengthening) on the mechanical properties and thermal conductivity of vermicular graphite cast iron is found. The results show that the balance of the mechanical and thermal properties of vermicular graphite cast iron can be regulated by increasing and strengthening the ferrite.