Novel water-air circulation quenching process for AISI 4140 steel

作者：Zheng Liyun^*; Zheng Dawei; Zhao Lixin; Wang Lihui; Zhang Kai

来源：Metals and Materials International, 2013, 19(6): 1373-1376.

DOI：10.1007/s12540-013-6034-7

• metals
• tempering
• fracture
• mechanical properties
• microstructure

AISI 4140 steel is usually used after quenching and tempering. 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. 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. The control of the water-cooling and air-cooling time is a key factor in the process. This paper focuses on the quenching temperature, water-air cycle time and cycle index to prevent cracking for AISI 4140 steel. 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. The tensile strength, Charpy impact energy at -10 A degrees C and hardness of the heat treated AISI 4140 steel after quenching and tempering were approximately 1098 MPa, 67.5 J and 316 HB, respectively.

• 出版日期2013-11
• 单位河北工程大学