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(一)前言可锻铸铁生产中,石墨化退火是关键的工序之一;退火时间长,能源消耗多是生产中的大问题。可锻铸铁工作者,长期以来致力于缩短退火周期、降低能耗的工艺研究,提出了诸如孕育处理、预温处理、预先淬火、液体介质中退火、锌气氛退火等新工艺。这些新工艺缩短退火时间的机理,一般都解释为这些工艺能显著增加石墨核心。应用这些工艺后,观察退火样品,的确发现石墨颗粒明显增多的现象。石墨颗粒的增多对可锻铸铁的机械性能有什么影响是生产者和使用者共同关心的问题。国外这方面有许多报导,国内尚缺乏系统的研究。一般认为,石墨颗
(A) Foreword In the production of malleable iron, graphitization annealing is one of the key processes; annealing a long time, energy consumption and more are major problems in production. Malleable cast iron workers, who have long been committed to shorten the annealing cycle and reduce the energy consumption of the technology research, put forward such as pregnancy treatment, pre-temperature treatment, pre-quenching, liquid medium annealing, zinc annealing and other new technology. The mechanism by which these new processes shorten the annealing time is generally explained as these processes can significantly increase the graphite core. After applying these processes, observation of annealed samples did reveal a marked increase in graphite particles. The impact of increasing graphite particles on the mechanical properties of malleable cast iron is a common concern for both producers and users. There are many reports abroad that there is still a lack of systematic research in China. Generally believed that graphite pieces