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1. 发明申请

US20090266449A1 METHOD OF CARBURIZING AND QUENCHING A STEEL MEMBER 审中-公开
标题翻译：钢和碳钢的成型方法
公开(公告)号：US20090266449A1
公开(公告)日：2009-10-29
申请号：US12428059
申请日：2009-04-22
申请人： Kouji OHBAYASHI , Kazuaki Okada
发明人： Kouji OHBAYASHI , Kazuaki Okada
IPC分类号： C23C8/22 , C23C8/00
CPC分类号： C23C8/22 , C21D1/18 , C21D3/04 , C23C8/80
摘要： A method of carburizing and quenching a steel member includes: a reduced pressure carburization step in which a steel member is contacted with carburization gas under reduced pressure, a slow cooling step in which the steel member is then slowly cooled in a cooling gas, and a quenching step of heating a selected portion of the cooled steel member using high-density energy and subsequently subjecting the selected portion to rapid cooling. The steel member subjected to the low-pressure carburization step includes a first portion in which a diffusion rate of carbon taken therein during carburization is high because of its shape and a second portion in which the diffusion rate of carbon is lower than that of the first portion. The reduced-pressure carburization step is controlled to give a carbon concentration at the surface of the first portion in a range of 0.65±0.1 weight % after diffusion.
摘要翻译：钢构件的渗碳淬火方法包括：减压渗碳工序，其中钢构件在减压下与渗碳气体接触，缓慢冷却步骤，其中钢构件然后在冷却气体中缓慢冷却，淬火步骤，使用高密度能量加热被冷却的钢构件的选定部分，随后对所选择的部分进行快速冷却。进行低压渗碳工序的钢构件由于其形状而在渗碳时被吸收的碳的扩散率高的第一部分和碳的扩散速度低于第一部分的第二部分一部分。控制减压渗碳步骤，使扩散后的第一部分表面的碳浓度在0.65±0.1重量％的范围内。

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