Deep rolling consists of plastic deformation of the workpiece surface layer without material removal. Although deep rolling has been systematically investigated over the last decades, the role played by the temperature developed during the process has not been fully understood yet, especially owing to the presence of a white layer seldom found beneath the deep rolled surface. In this work, the workpiece temperature is measured when deep rolling hardened AISI 4140 steel employing two different approaches, both based on the implanted thermocouple method and wireless communication. The influence of deep rolling pressure, speed and feed and workpiece hardness (39 and 50 HRC) on the workpiece temperature is assessed and the temperature in the contact zone between ball and workpiece is determined. The findings indicate that the rolling parameters and workpiece hardness do not significantly affect the temperature beneath the surface. However, a thin white layer is observed when deep rolling using the highest pressure value (300 bar), thus suggesting that severe plastic deformation is the only phenomenon associated with its formation.

深滚压包括工件表层的塑性变形而不去除材料。尽管在过去的几十年里已经系统地研究了深轧，但尚未完全了解在此过程中产生的温度所起的作用，特别是由于在深轧表面下很少发现白色层的存在。在这项工作中，使用两种不同的方法测量深轧硬化 AISI 4140 钢时的工件温度，这两种方法都基于植入热电偶方法和无线通信。评估深轧压力、速度和进给以及工件硬度（39 和 50 HRC）对工件温度的影响，并确定球与工件接触区的温度。研究结果表明，轧制参数和工件硬度不会显着影响表面下的温度。然而，当使用最高压力值 (300 bar) 进行深轧时，会观察到一层薄薄的白色层，这表明严重的塑性变形是与其形成相关的唯一现象。