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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Austempering Time on Mechanical Properties of a Low Manganese Austempered Ductile Iron
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Effect of Austempering Time on Mechanical Properties of a Low Manganese Austempered Ductile Iron

机译：奥氏体化时间对低锰奥氏体球墨铸铁力学性能的影响

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摘要

An investigation was carried out to examine the influence of austempering time on the resultant microstructure and the room-temperature mechanical properties of an unalloyed and low manganese ductile cast iron with initially ferritic as-cast structure. The effect of austempering time on the plane strain fracture toughness of this material was also studied. Compact tension and round cylindrical tensile specimens were prepared from unalloyed ductile cast iron with low manganese content and with a ferritic as-cast (solidified) structure. These specimens were then austempered in the upper (371 deg C) and lower (260 deg C) bainitic temperature ranges for different time periods, ranging from 30 min. to 4 h. Microstructural features such as type of bainite and the volume fraction of ferrite and austenite and its carbon content were evaluated by X-ray diffraction to examine the influence of microstructure on the mechanical properties and fracture toughness of this material.The results of the present investigation indicate that for this low manganese austempered ductile iron (ADI), upper ausferritic microstructures exhibit higher fracture toughness than lower ausferritic microstructures. Yield and tensile strength of the material was found to increase with an increase in austempering time in a lower bainitic temperature range, whereas in the upper bainitic temperature range, time has no significant effect on the mechanical properties. A retained austenite content between 30 to 35 % was found to provide optimum fracture toughness. Fracture toughness was found to increase with the parameter (X #gamma# C #gamma#/d)~1/2, where X#gamma# is the volume fraction of austenite, C #gamma# is the carbon content of the austenite, and d is the mean free path of dislocation motion in ferrite.
机译：进行了调查，以研究奥氏体化时间对最终具有初始铁素体铸态组织的低合金球墨铸铁的显微组织和室温机械性能的影响。还研究了回火时间对这种材料的平面应变断裂韧性的影响。用锰含量低，铁素体铸态（凝固）组织的非合金球墨铸铁制备致密拉伸试样和圆柱拉伸试样。然后将这些样品在较高的贝氏体温度范围（371摄氏度）和较低的贝氏体温度（260摄氏度）中回火，持续时间为30分钟。至4小时通过X射线衍射评估了贝氏体类型，铁素体和奥氏体的体积分数及其碳含量等显微组织特征，以研究显微组织对这种材料的力学性能和断裂韧性的影响。本研究结果表明对于这种低锰奥氏体球墨铸铁（ADI），高奥氏体组织比低奥氏体组织具有更高的断裂韧性。发现在较低的贝氏体温度范围内，材料的屈服强度和拉伸强度随回火时间的增加而增加，而在较高的贝氏体温度范围内，时间对机械性能没有显着影响。发现保留的奥氏体含量在30％至35％之间可提供最佳的断裂韧性。发现断裂韧性随参数（X＃gamma＃C＃gamma＃/ d）〜1/2的增加而增加，其中X＃gamma＃是奥氏体的体积分数，C＃gamma＃是奥氏体的碳含量， d是铁素体中位错运动的平均自由程。

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