论文部分内容阅读
一.引言 我厂采用0.5吨工频炉熔炼（酸性炉衬,叠箱造型,生产单体硼钨铸铁活塞环。铸态下毛坯的金相组织是:珠光体+F型石墨+含硼硬质点。生产中我们将各种活塞环的含硼量笼统地控制在0.04％左右,但含硼硬质相块度（以下简称块度）为三级的情况时有发生。少数情况下伴随着含硼硬质相分布较差（二级分布）同时出现,而多数是在含硼硬质相分布、数量、组成均为一级,而网孔为三级的情况下出现三级块度,由此而引起了大量金相报废。因此,在活塞环毛坯的生产中如何有效地控制块度,提高含硼硬质相的金相合格率,已成为我们生产硼钨铸铁活塞环所关注的问题。
I. INTRODUCTION I plant using 0.5 ton frequency furnace smelting (acid lining, stack box modeling, the production of single boron-tungsten cast iron piston ring castings under the microstructure is: pearlite + F graphite + boron-containing hard In production, we control the boron content of all kinds of piston rings generally around 0.04%, but the boron-containing hard phase lumpiness (hereinafter referred to as lumpiness) has three levels from time to time .A few cases are accompanied by Boron poor distribution of hard phase (secondary distribution) appear at the same time, while the majority is in the distribution of boron-containing hard phase, the number and composition are one level, while the mesh is three levels of third-level block, Resulting in a large number of metallurgical scrap, so how to effectively control the block in the production of piston ring blank to improve the metallurgical pass rate of the boron-containing hard phase has become the focus of our production of boron-tungsten cast iron piston rings problem.