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Thermomechanical processing of spring steel rod with reducing sizing mills for improved properties and microstructure

机译:用减径定径机对弹簧钢棒进行热机械加工,以改善其性能和组织

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摘要

The results of rolling trials show definite evidence of grain refinement and promotion of structural uniformity as a result of thermomechanical rolling through the Reducing Sizing Mill. Although the trials to date have been limited to several sizes and grades, the results show that a desirable change in material hardness, reduction of area and tensile strength can be produced with purpose designed rolling mill equipment and process parameters. These encouraging results pave the way for much more investigation of TMR on different sizes, grades and rolling temperatures. Studies on other sizes of these same grades would be helpful to quantify the influence of strain/strain rate and strain dis-tribution throughout the rod section, on the evolution of microstructure. Further trials with other grades, sizes and rolling temperatures are being planned. From the perspective of bar or rod rolling, this type of work has not been extensively reported for this fairly unique combination of high strain rates, short interpass times and consequent accumulated strain on medium to high plain carbon and alloy steels. For the wiredrawer, the benefits are immediately realized in the form of a more consistent drawing product, greater uniformity, and elimination/reduction of time consuming and costly post-rolling heat treatments.
机译:轧制试验的结果表明,通过热轧机进行的精轧,晶粒细化并促进了结构均匀性的确凿证据。尽管迄今为止的试验仅限于几种尺寸和等级,但结果表明,使用专门设计的轧机设备和工艺参数,可以实现材料硬度,面积减小和拉伸强度的理想变化。这些令人鼓舞的结果为在不同尺寸,等级和轧制温度下进行TMR的更多研究铺平了道路。对这些相同等级的其他尺寸的研究将有助于量化应变/应变速率和整个棒材截面的应变分布对微观结构演变的影响。正在计划使用其他等级,尺寸和轧制温度的进一步试验。从棒材或棒材轧制的角度来看,这种工作方式尚未得到广泛报道,因为它是高应变率,短过渡时间和随之而来的中高碳素钢和合金钢累积应变的独特结合。对于拉丝机而言,好处是可以以更一致的拉拔产品,更大的均匀性以及消除/减少耗时且昂贵的轧后热处理的形式实现。

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