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首页> 外文期刊>ISIJ international >Inhibition of Grain and Precipitate Growth of AISI M2 Type Tool Steel Powders by Low-temperature Nitriding Using Flowing Ammonia Gas
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Inhibition of Grain and Precipitate Growth of AISI M2 Type Tool Steel Powders by Low-temperature Nitriding Using Flowing Ammonia Gas

机译：流动氨气的低温渗氮抑制AISI M2型工具钢粉末的晶粒并析出

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Following conclusions were drawn from the present work. (1) Ferritic M2 steel powders are fully nitrided to hep ε-phase possessing composition close to Fe_2N under flow of NH_3 gas within 3 h in the range of temperature between 550 and 600℃. (2) Specimen prepared from cold-pressed pellet of such fully nitrided powders by sintering at 1 240℃ in vacuum for 1 h was rather porous while porosity of the sintered body prepared from cold-pressed pellet of partially nitrided powders (a mixture of α-phase and ε-phase) was comparable to that of the reference speci- men prepared from cold-pressed pellet of the as-received M2 steel powders. (3) Size of precipitates in the sintered specimen prepared from the fully nitrided powders was very fine and distribution of precipitate particles was homogeneous while coarse M_6C type precipitates along grain boundaries were observed in the sintered specimen prepared from the partially nitrided powders as well as in the reference specimen prepared from the as-received M2 powders. (4) While retention of N atoms introduced into matrix of M2 steel powders by low-temperature nitrid-ing using flowing NH_3 gas is not possible after the sintering process, microstructure refinement effect is gained. Insertion of such nitriding process must be of pragmatic help to inhibit undesired grain and precipitate growth for some type of alloys. (5) Steel powders subjected to the low-temperature nitriding under flowing NH_3 gas could be used as starting material for production of porous steel components.
机译：从当前工作中得出以下结论。 （1）在550〜600℃的温度下，在3h的NH_3气流下，将铁素体M2钢粉完全氮化成接近Fe_2N的ε相。 （2）由这样的完全氮化粉末的冷压颗粒通过在真空中于1240℃烧结1h制备的样品是相当多孔的，而由部分氮化粉末的冷压颗粒（α的混合物）制备的烧结体的孔隙率较高。相和ε相）与从原样M2钢粉的冷压丸料制备的参考样品相当。 （3）由完全氮化的粉末制成的烧结样品中的析出物尺寸非常细，且析出物颗粒的分布均匀，而在由部分氮化的粉末制成的烧结样品中以及在试样中观察到沿晶界的粗M_6C型析出物。由原样的M2粉末制备的参考样品。 （4）虽然在烧结之后不可能通过使用流动的NH_3气体的低温氮化来保留引入M2钢粉基体中的N原子，但是获得了细化组织的效果。对于某些类型的合金，插入这样的氮化过程必须在实用上有助于抑制不希望的晶粒和沉淀生长。 （5）在流动的NH_3气体下经过低温氮化的钢粉可用作生产多孔钢构件的原材料。

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