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首页> 外文会议>Eighth International Fatigue Congress Vol.5, Jun 3-7, 2002, Stockholm, Sweden >Influence of Two Step Austempering Heat Treatment Process on High Cycle Fatigue Strength of Austempered Ductile Cast Iron (ADI)
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Influence of Two Step Austempering Heat Treatment Process on High Cycle Fatigue Strength of Austempered Ductile Cast Iron (ADI)

机译：两步奥氏体热处理工艺对奥氏体球墨铸铁（ADI）高周疲劳强度的影响

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摘要

Austempered Ductile Cast Iron (ADI) has emerged as a major engineering material in recent years because of its excellent mechanical properties. These include high strength with good ductility, good wear resistance and fatigue strength. It is therefore considered as an economical substitute for wrought or forged steel in several structural applications especially in the automotive industry. In this investigation, a low manganese ductile cast iron with predominantly pearlitic as-cast structure was processed by a unique two-step austempering process conceived by this investigator. Two batches of samples were prepared. All the specimens were initially austenitized at 927 ℃ for 2 hrs. The first batch of samples were processed by conventional single step austempering process at several temperatures such as 316 ℃, 343 ℃, 357 ℃ for 2 hrs, whereas the second batch of samples were processed by two-step austempering process. These samples were initially quenched to the above austempering temperatures and while being kept at these temperatures in a salt bath, the temperature of the salt bath was raised by 14 ℃ per hour for 2 hours. The effect of this novel two step austempering heat treatment on the microstructure and high cycle fatigue strength of the material were examined. Test results show significant improvement in mechanical properties and high cycle fatigue strength of the material as a result of two-step austempering process.
机译：奥氏体球墨铸铁（ADI）近年来因其出色的机械性能而成为主要的工程材料。这些包括高强度，良好的延展性，良好的耐磨性和疲劳强度。因此，在某些结构应用中，尤其是在汽车工业中，它被认为是锻造或锻造钢的经济替代品。在这项研究中，研究人员构思了独特的两步奥氏体回火工艺，加工了主要为珠光体铸态组织的低锰球墨铸铁。制备了两批样品。所有试样均在927℃下进行奥氏体化2小时。第一批样品在316℃，343℃，357℃等几个温度下通过常规的单步奥氏体化工艺处理了2个小时，而第二批样品则通过两步奥氏体化工艺进行了处理。首先将这些样品淬火至上述的回火温度，并在盐浴中保持在这些温度下，然后将盐浴的温度每小时提高14℃2小时。研究了这种新颖的两步式回火热处理对材料的组织和高周疲劳强度的影响。测试结果表明，通过两步回火工艺，材料的机械性能和高循环疲劳强度得到了显着改善。

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