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2. 发明申请

US20110126946A1 BAINITE STEEL AND METHODS OF MANUFACTURE THEREOF 有权
标题翻译： BAINITE钢及其制造方法
公开(公告)号：US20110126946A1
公开(公告)日：2011-06-02
申请号：US12737630
申请日：2009-07-31
申请人： Harshad Kumar Dharamshi Hansraj Bhadeshia , Carlos Garcia-Mateo , Peter Brown
发明人： Harshad Kumar Dharamshi Hansraj Bhadeshia , Carlos Garcia-Mateo , Peter Brown
IPC分类号： C21D8/00 , C22C38/00 , C22C38/22 , C22C38/44 , C21D6/00
CPC分类号： C22C38/22 , C21D1/18 , C21D1/20 , C21D2211/002 , C22C38/04 , C22C38/24 , C22C38/34
摘要： Super Bainite Steel is described comprising between 90% and 50% bainite, the rest being austenite, in which excess carbon remains within the bainitic ferrite at a concentration beyond that consistent with equilibrium; there is also partial partitioning of carbon into the residual austenite. Such bainite steel has very fine bainite platelets (thickness 100 nm or less). In this specification the expression “Super Bainite Steel” is used for such steel. In particular, the impact of varying the manganese content to achieve fast transformation times, and hence low manufacturing costs without the presence of expensive alloying materials is discussed. In one embodiment of the invention a Super Bainite Steel comprises in weight percent: carbon 0.6 to 1.1%, silicon 1.5 to 2.0%, manganese 0.5 to 1.8%, nickel up to 3%, chromium 1.0 to 1.5%, molybdenum 0.2 to 0.5%, vanadium 0.1 to 0.2%, balance iron save for incidental impurities. In particular it was noted that excellent properties were obtained if the manganese content is about 1% by weight. Various processes for making the Super Bainite Steel are discussed, but a particularly useful process includes the step of cooling the steel from an austenite quickly enough to avoid transformation to pearlite and transforming the steel to bainite at a temperature in the range 190° C. to 2500° C. The patent discusses the impact of changing the transition temperature on hardness, and conclude that the invention can provide a very hard steel (>630HV) It is also noted that suitable pearlite can be produced for cutting drilling and shaping, before final transformation to Super Bainite Steel.
摘要翻译：描述了超级贝氏体钢，其包含90％至50％的贝氏体，其余为奥氏体，其中过量的碳保留在贝氏铁素体内的浓度超过与平衡一致的浓度; 还有一部分碳分为残余奥氏体。这种贝氏体钢具有非常细的贝氏体血小板（厚度为100nm以下）。在本说明书中，“超级贝氏体钢”用于这种钢。特别地，讨论了改变锰含量以实现快速转化时间的影响，并因此降低了制造成本，而没有昂贵的合金材料的存在。在本发明的一个实施方案中，超级贝氏体钢以重量百分比计包含：0.6-1.1％的碳，1.5-2.0％的硅，0.5-1.8％的镍，至多3％的镍，1.0-1.5％的铬，0.2-0.5％的钼，，钒0.1〜0.2％，余铁除偶然杂质。特别地，注意到如果锰含量为约1重量％，则获得了优异的性能。讨论了用于制造超级贝氏体钢的各种方法，但是特别有用的方法包括从奥氏体中快速冷却钢的步骤，以避免转变成珠光体并在190℃至190℃的温度下将钢转变成贝氏体，该专利讨论了改变转变温度对硬度的影响，并得出结论，本发明可以提供非常硬的钢（> 630HV）。还应指出，可以在最终产生切割钻孔和成型之前生产合适的珠光体转变为超级贝氏体钢。

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