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首页> 外文会议>Researches in Powder Metallurgy >Gigacycle Fatigue Response of PM versus Ingot Metallurgy Tool Steels
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Gigacycle Fatigue Response of PM versus Ingot Metallurgy Tool Steels

机译：PM与铸锭冶金工具钢的Gigacycle疲劳响应

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摘要

In this work, the gigacycle fatigue response of several tool steel grades has been studied using an ultrasonic resonance testing device. It showed that both with ingot metallurgy (IM) and powder metallurgy (PM) tool steels, a true fatigue limit does not exist up to 10E10 cycles. PM steels resulted in significantly higher endurance strength levels than IM grades. However, there was virtually no effect of the composition and hardness of the materials, both for PM and IM grades cold work tool steels and high speed steels exhibiting virtually the same S-N curves. In the IM tool steel grades, crack initiation started at large primary carbides or carbide clusters, while in the PM grades, nonmetallic inclusions were the critical sites. In any case it is very important to avoid introducing residual stresses into the specimen surfaces during preparation, which would markedly shift the endurance strength levels.
机译：在这项工作中，已经使用超声波共振测试设备研究了几种工具钢的千兆环疲劳响应。结果表明，对于铸锭冶金（IM）和粉末冶金（PM）工具钢，直到10E10循环都没有真正的疲劳极限。 PM钢的耐力强度等级明显高于IM级。但是，对于PM和IM级冷作工具钢和表现出几乎相同的S-N曲线的高速钢，材料的成分和硬度几乎没有影响。在IM工具钢种中，裂纹萌生始于大型初级碳化物或碳化物簇，而在PM类钢中，非金属夹杂物是关键部位。在任何情况下，避免在制备过程中将残余应力引入样品表面都是非常重要的，这会明显改变耐力强度水平。

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