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1.前言最近,发表不少球最铸铁热处理强韧化的研究文献,但是和锻钢件的热处理相比,对铸件的这种生产方法认识还比较浅。然而,最近在铸造行业,正在呼吁扩大铸件的应用。为了提高机械零件的性能、减轻重量及降低成本,希望充分有效地利用经热处理的球墨铸铁,扩大其应用,以取代原来用的热处理锻钢零件。强韧化处理有多种方法,其中有代表性的有: (1)在共析转变温度范围,使之变为铁素体+珠光体的微细混合组织。 (2)对容易加工的铁素体球墨铸铁,机械加工后在850～900℃奥氏体状态下使石墨碳均匀扩散,于230～500℃进行等温处理,根据使用需要,可以推荐变形小的下贝氏体或上贝氏体等温处理方法。
1. Introduction Recently, many research reports on the toughening of the most cast iron balls have been published. However, compared with the heat treatment of forged steel castings, the understanding of such production methods of castings is still rather shallow. However, recently in the foundry industry, there is an appeal to expand the application of castings. In order to improve the performance of mechanical parts, reduce weight and reduce costs, we hope to make full and effective use of heat-treated ductile iron to expand its application to replace the original heat-treated forged steel parts. Toughening treatment There are a variety of methods, of which the representative are: (1) in the eutectoid transformation temperature range, make it into ferrite + pearlite fine mixed organization. (2) Ferrite nodular cast iron, which is easy to process, is machined to uniformly spread graphite carbon in the austenitic state at 850-900 ° C and isothermally treated at 230-500 ° C. According to the needs of use, Lower bainite or bainite isothermal treatment method.