首页> 外国专利> METHOD FOR STRENGTHENING FATIGUE STRENGTH OF SPHEROIDAL GRAPHITE CAST IRON WITH HIGH FREQUENCY INDUCTION-SURFACE HARDENING AND SPHEROIDAL GRAPHITE CAST IRON EXCELLENT IN FATIGUE STRENGTH

METHOD FOR STRENGTHENING FATIGUE STRENGTH OF SPHEROIDAL GRAPHITE CAST IRON WITH HIGH FREQUENCY INDUCTION-SURFACE HARDENING AND SPHEROIDAL GRAPHITE CAST IRON EXCELLENT IN FATIGUE STRENGTH

机译：高频感应-表面强化和高强度球状石墨铸铁强化球墨铸铁疲劳强度的方法

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摘要

PROBLEM TO BE SOLVED: To strengthen fatigue strength in a spheroidal graphite cast iron having much ferrite by applying a high frequency induction-surface hardening. SOLUTION: The high frequency induction-surface hardening is applied to the spheroidal graphite cast iron having 400-500 MPa tensile strength, 250-350 MPa 0.2% proof stress, =7% elongation and =30% area ratio of the ferrite in a matrix structure, to generate the compression residual stress and thus, a rotating bending fatigue strength at a room temperature is improved to =350 MPa at 106 times. Further, the fatigue strength can be further improved by applying an ultra-rapid heating-hardening at =2000 deg.C/sec.

机译：解决的问题：通过施加高频感应表面淬火来增强铁素体含量较高的球墨铸铁的疲劳强度。解决方案：高频感应表面淬火适用于球墨铸铁，其抗拉强度为400-500 MPa，屈服强度为250-350 MPa 0.2％屈服强度，伸长率== 7％，且铁素体的面积比≥= 30％基质结构，以产生压缩残余应力，因此，在室温下的旋转弯曲疲劳强度在106倍时提高到> = 350 MPa。此外，通过以> = 2000℃/秒进行超快速加热硬化，可以进一步改善疲劳强度。

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公开/公告号JP2002212631A

专利类型
公开/公告日2002-07-31

原文格式PDF
申请/专利权人 HIGH FREQUENCY HEATTREAT CO LTD;HITACHI METALS LTD;
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申请/专利号JP20010007428
发明设计人 MISAKA YOSHITAKA;KAWASAKI KAZUHIRO;ISHIZAWA TOSHITAKA;SHIMIZU MASAO;KOMOTORI JIYUN;NAKAZAWA SHOICHIRO;
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申请日2001-01-16
分类号C21D5/00;C21D1/10;C21D9/32;F16H55/06;
国家 JP
入库时间 2022-08-22 00:56:21

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