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首页> 外文会议>2002 World Congress on Powder Metallurgy amp; Particulate Materials Pt.2 Jun 16-21, 2002 Orlando, FI >Diffusion-bonded Molybdenum Steel Powders for High Strength Applications
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Diffusion-bonded Molybdenum Steel Powders for High Strength Applications

机译：高强度应用中的扩散结合钼钢粉

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摘要

New applications in the field of powder metallurgy require materials and process technologies which permit the economic production of high strength PM parts. High mechanical properties can be achieved by the use of pre-alloyed molybdenum steel powders. Direct sinter hardening of pre-alloyed molybdenum steel powders diffusion-bonded with nickel and copper in special furnaces with rapid cooling zones allows a martensitic microstrucrure to be produced. The paper illustrates the mechanical properties of a pre-alloyed 1.5% molybdenum steel powder to which 2% copper and 4% nickel have been diffusion-bonded. Copper and nickel were diffusion-bonded to the base material to avoid segregation of press ready mixes and to ensure dimensional stability. The mechanical properties of pressed, sintered and tempered specimens made from press ready mixes based on the optimised molybdenum steel powder were evaluated at different carbon contents and at different sintered densities. Furthermore the microstrucrure of above mentioned specimens were evaluated to determine the effect of different cooling rates. The optimised pre-alloyed molybdenum steel powder allows the manufacturing of PM parts with a tensile strength of more than 850 MPa by using normal sintering conditions in belt furnaces equipped with a rapid cooling zone.
机译：粉末冶金领域的新应用需要能够经济地生产高强度粉末冶金零件的材料和工艺技术。通过使用预合金钼钢粉可以实现较高的机械性能。在具有快速冷却区的特殊熔炉中，将预合金钼钢粉末与镍和铜进行扩散结合直接烧结硬化，从而可以生产马氏体微结构。该论文说明了一种预合金的1.5％钼钢粉的机械性能，其中2％的铜和4％的镍已扩散结合到该粉末上。将铜和镍扩散结合到基础材料上，以避免压制成型混合物的分离并确保尺寸稳定性。在不同的碳含量和不同的烧结密度下，基于优化的钼钢粉，对由预压混合物制成的压制，烧结和回火试样的机械性能进行了评估。此外，对上述样品的微结构进行了评估，以确定不同冷却速率的影响。经过优化的预合金钼钢粉，通过在配备有快速冷却区的带式炉中使用正常的烧结条件，可以制造抗拉强度超过850 MPa的PM零件。

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