铜、锑及硅含量对厚大断面珠光体球墨铸铁组织和性能的影响

Effects of Cu,Sb and Si Contents on Microstructure and Properties of Heavy Section Pearlite Nodular Iron

采用砂型浇注出厚大断面珠光体球墨铸铁试样,研究了铜、锑合金化元素和硅含量对厚大断面球墨铸铁组织和性能的影响规律。结果表明:加入适量锑可消除厚大断面球铁心部的碎块状石墨,有效改善其力学性能;添加适量铜可有效促进基体的珠光体化,提高拉伸性能;另外,适当降低硅含量可提高球铁的珠光体含量和强度;对于尺寸为250mm×250mm×300mm的厚大断面试样,加入0.015%锑和0.5%铜并将硅含量控制为2.1%,可获得较好的综合性能。

A heavy section pearlite nodular iron was fabricated using sand casting. The effects of Cu, Sb alloying elements and Si contents on the microstructure and properties of nodular iron were investigated. The results show the chunky graphite in the central part of heavy section nodular iron can be eliminated and the performance was improved by adding appropriate Sb. Properly increasing Cu addition could improve pearlite content and tensile properties. The pearlite content and strength of heavy section nodular iron were improved by reasonable reducing Si content. When the addition quantity of Cu and Sb were 0. 5%o and 0. 015%, and the Si content was 2. l%, the heavy section pearlite nodular iron in size of 250 mm × 250 mm ×300 mm could be obtained good overall performance.