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经化学成分的设定,采用铬合金化的方式,研制了一种低铬耐热球墨铸铁材料。通过显微组织观察、力学性能试验、加工性能试验、高温耐热性试验,研究了所研制耐热球墨铸铁材料的组织和性能。试验结果表明,所研制球铁的显微组织为珠光体+少量铁素体的基体上分布着球状石墨;不同铬成分试样的力学性能、加工性能和耐热性能都较好,尤以1.6wt%的组分的性能最好。可见,铬合金化球铁是一种综合性能较优异的材料,可在800℃下长期使用。
The chemical composition of the setting, the use of chromium alloy way, developed a low-chromium heat-resistant ductile iron material. Through the microstructure observation, mechanical property test, processing property test and high temperature heat resistance test, the microstructure and properties of the developed heat-resistant ductile iron material were studied. The test results show that the microstructure of ductile iron is a pearlite + a small amount of ferrite distributed on the matrix of spherical graphite; different chromium composition of the specimen mechanical properties, processing performance and heat resistance are better, especially 1.6 The best wt% components. Visible, chrome-alloy ductile iron is a more excellent overall performance of the material, long-term use at 800 ℃.