球化剂颗粒尺寸对模拟大断面球墨铸铁件组织及性能的影响

Influence of Nodulizer Sizes on Mechanical Properties and Graphite Morphologies of Simulated Heavy Section Ductile Iron

在实验室条件下,利用高能球磨方法得到平均尺寸为120 μm、40 μm的球化剂,利用自行研制的1 500℃高温多功能组合式模拟电阻炉,通过热补偿的方式控制炉内小型铸件的冷却凝固过程,实现对尺寸为Φ590 mm×800mm的大断面球墨铸铁件内部组织及性能的模拟研究.结果表明,随着球化剂尺寸从原始的3～5 mm降到40 μm,试样中的石墨形态得到改善,抗拉强度从432.4 MPa上升到523.9 MPa,伸长率也从2.35％上升到3.48％.

Nodulizer with sizes of 120 μm and 40 μmwere prepared by high energy ball-milling method, and a specially designed 1 500 ℃ multifunctional furnace was used to simulate the cooling and solidifying process of small size casting, and this paper aimed to find out the influence of nodulizer sizes on simulated heavy section ductile iron which had the size of590 mmx800 mm. The results show that with the decrease ofnodulizer sizes from 3-5 mm to 40 μm, the graphite morphology becomes better, and the tensile strength and elongation increase from 432.4 MPa to 523.9 MPa, and 2.35% to 3.48%, respectively.