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首页> 外文期刊>Journal of Materials Engineering and Performance >Study of the Isothermal Transformation of Ductile Iron with 0.5 percent Cu by Electrical Resistance Measurement
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Study of the Isothermal Transformation of Ductile Iron with 0.5 percent Cu by Electrical Resistance Measurement

机译：用电阻法研究含0.5％铜的球墨铸铁的等温转变

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A computer-controlled system for measuring electrical resistance has been developed and used to study the Isothermal transformation of austenite in a ductile iron (3.31 percent C, 3.12 percent Si, 0.22 percent Mn, 0.55 percent Cu). The ability of the technique to follow the Isothermal decomposition of ausfenite was established by measurements on an AISI4340 steel. The times at which the austenite decomposed to primary ferrite, pearlite, and bainite were accurately detected. In the ductile iron, the formation of pearlite and of bainite was easily detected, and an isothermal transformation diagram was constructed from the results. The temperature range for the formation of bainite Is especially important in producing austempered ductile iron (ADI) and was mapped. An Initial stage of decomposition of austenite to ferrite and high-carbon austenite is followed by a time delay; then the high-carbon austenite decomposes to bainite. The formation of ADI requires austemperlng to a structure of ferrite and high-carbon austenite, then quenching to retain this structure, thus avoiding the formation of bainite. This Is achieved by isothermal transformation into the time-delay region. For the ductile Iron studied here, this time region was about 2.6 h at 400 deg C and increased to 277 h at 300 deg C.
机译：已经开发了一种用于测量电阻的计算机控制系统，并将其用于研究球墨铸铁（3.31％C，3.12％Si，0.22％Mn，0.55％Cu）中奥氏体的等温转变。通过在AISI4340钢上进行测量，可以确定该技术跟踪奥氏体等温分解的能力。准确地检测出奥氏体分解为原生铁素体，珠光体和贝氏体的时间。在球墨铸铁中，容易检测到珠光体和贝氏体的形成，并根据结果绘制了等温转变图。贝氏体形成的温度范围在生产奥氏体球墨铸铁（ADI）中尤其重要，并绘制了图表。奥氏体分解为铁素体和高碳奥氏体的初始阶段是一个延时。然后高碳奥氏体分解为贝氏体。 ADI的形成要求奥氏体化为铁素体和高碳奥氏体的结构，然后淬火以保留该结构，从而避免了贝氏体的形成。这是通过等温转换到延时区域来实现的。对于此处研究的球墨铸铁，该时间区域在400摄氏度下约为2.6小时，而在300摄氏度下则增加到277小时。

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