A kind of low hardenability high carbon gear steel and heat treatment process
A hardenability, gear steel technology, applied in heat treatment furnaces, heat treatment equipment, improvement of process efficiency, etc., can solve the problems of low surface carbon content and insufficient wear resistance, saving energy and reducing fatigue The effect of performance and wear resistance
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Embodiment 1
[0028] The material composition used is wt%: 1.5C, 2.5Si, 0.5Cr, 0.1Mo, 0.01Cu, and the balance is Fe. After austenitizing at 1050°C, the required size is forged and quenched, and the final forging temperature is 900°C. The forging is heated at 820°C for 1 hour, cooled to 700°C at a rate of 20°C / min, and then air-cooled to obtain figure 1 organization shown. The hardness curve after induction heat treatment is as follows: figure 2 As shown in the UHCS-1 curve, a good thin shell quenching effect is achieved, the surface hardness reaches 1000HV, and the depth of the hardened layer is about 1.5mm, such as image 3 shown.
Embodiment 2
[0030] The material components used are (wt%): 1.0C, 1.0Si, 0.1Cr, 0.3Mo, 0.01Cu and the balance is Fe. After austenitizing at 1050°C, the required size is forged and quenched, and the final forging temperature is 900°C. The forging is heated at 800°C for 6 hours, cooled to 650°C at a rate of 20°C / min, and air-cooled to obtain a ferrite + granular cementite spheroidized structure. After induction heat treatment, the hardness distribution along the surface to the core is as follows: figure 2 Shown in the UHCS-2 curve. The surface hardness is 900HV, and the depth of the hardened layer is about 1.8mm, achieving the effect of thin shell quenching.
Embodiment 3
[0032] The material composition used is (wt%): 1.35C, 0.5Si, 0.5Cr, 0.01Mo, 0.3Cu, and the balance is iron. After austenitizing at 1100°C, the required size is forged and quenched, and the final forging temperature is 850°C. The forging is heated at 800°C for 8 hours, cooled to 650°C at a rate of 20°C / min, and air-cooled to obtain a ferrite + granular cementite spheroidized structure. After induction heat treatment, the hardness distribution along the surface to the core is as follows: figure 2 Shown in the UHCS-3 curve. The surface hardness is 900HV, and a slower hardness gradient appears. The hardness is reduced to 700HV at a distance of 3mm from the surface layer, and the total depth of the hardened layer is about 3mm, achieving the effect of thin shell quenching.
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