However, these data do not adequately characterize the actual production quenching process in terms of heat transfer behavior in many cases, especially when high temperature gradients are present. The type of information obtained from such probes provides a good basis for comparing media, characterizing general cooling capabilities, and checking media condition over time. For this purpose, a variety of commercial probes, as well as the necessary data acquisition system for determining the time-temperature data for a set of standardized test conditions, are available for purchase. Quench probes have been used effectively to characterize the quality of quenchants for many years. The tensile strength, Charpy impact energy at -10 Â☌ and hardness of the heat treated AISI 4140 steel after quenching and tempering were approximately 1098 MPa, 67.5 J and 316 HB, respectively.Ĭharacterizing Water Quenching Systems with a Quench Probeįerguson, B. The optimum heat treatment parameters to achieve a good match of the strength and toughness of AISI 4140 steel were obtained by repeated adjustment of the water-air circulation quenching process parameters. This paper focuses on the quenching temperature, water-air cycle time and cycle index to prevent cracking for AISI 4140 steel. The control of the water-cooling and air-cooling time is a key factor in the process.
A water-air circulation quenching process can solve the problems of quenching cracks with water and the high cost quenching with oil, which is flammable, unsafe and not enough to obtain the required hardness. During the heat treatment process in industry production, there are some problems, such as quenching cracks, related to water-cooling and low hardness due to oil quenching.
Zheng, Liyun Zheng, Dawei Zhao, Lixin Wang, Lihui Zhang, KaiĪISI 4140 steel is usually used after quenching and tempering. Novel water-air circulation quenching process for AISI 4140 steel
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