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近年来在某些机械或农具制造厂所生产的可鍜铸铁,焖火後偶而发现焖件很脆,一打就断,打断後观察其断面为亮白色,倘用普通国内改装的金相显微镜来进行金相检验,往往由於金相显微镜的质量关系、或磨片浸蚀不佳等原因,因此发现不出其组织有什么毛病,以致操作者常误认为是爐料不合或焖火时间不够。某机械厂在去年六、七月间曾有连续数爐可鍜鑄铁焖件均发生此毛病而不知其原因何在,後来得到科学研究部门的协助,始行解决。某农具厂鍜工车间在一批低碳鋼钣中发现经过冷冲压後,韧性很差,断面白色,现场操作者误认为此种鋼非低碳鋼而是别种鋼料。这些白口断面的产生,经科学研究部门的研究及显微分析,才知道是由於三次碳化铁
In recent years in some machinery or farm tools produced by the cast iron, stewing fire and then found the stew pieces are very fragile, a dozen off, after the interruption of the observation section of bright white, with ordinary domestic modification of the metallographic Microscopes for metallographic examination, often due to the quality of the metallurgical microscope, or erosion of the bad film and other reasons, we can not find any problems with their organizations, so that operators often mistaken for improper charge or fire time is not enough . In the last six or seven months of last year, a machinery plant had suffered several problems in continuous cast iron stewing pieces without knowing the reasons for the problems. Later, it was assisted by the scientific research department and started to solve the problems. A farm machinery factory workers workshop found in a group of low-carbon steel sheet after cold stamping, poor toughness, white section, the scene operator mistakenly believe that this kind of steel, but not other kinds of steel. The emergence of these white sections, the research department by the scientific research and microscopic analysis, we know that the three iron carbide