The test method test is carried out step by step optimization according to the process parameters of the hot coil spring. To separate the interaction of temperature and thermal deformation during hot coiling, air cooling is used to simulate the change in hot coil temperature from preheating to oil ingress. Firstly, orthogonal optimization experiments were carried out with two temperature parameters (preheating temperature and temperature), then thermal deformation simulation was added to adjust the optimization space of the above parameters, and the impact toughness and the microscopic morphology of the corresponding fractures were evaluated. The sample size used for the temperature parameter test is 715mm@715mm@55mm. The sample is heated in a box furnace at two preheating temperatures of 940e and 920e. After air cooling for 20s, it is quenched and cooled in the oil tank, and then returned at 340e, 380e and 420e. fire. Then, after grinding, a non-standard unnotched impact specimen of 7@7@55 (mm) was prepared, and the optimized temperature parameter range was screened by testing the impact toughness. Using the same size sample, the thermal deformation simulation test was carried out at 900e, 910e and 920e according to the thermal deformation specification under the optimized temperature parameters, and then tempered at 380e, 390e and 400e. Then, after grinding, a non-standard unnotched impact specimen of 7@7@55(mm) was prepared. The final optimized parameter range was selected by testing the impact toughness, and the microscopic morphology of the impact fracture was observed by S570 scanning electron microscope. The SAE9259 spring steel used for the test material test is a hot-rolled round steel. The influence of hot processing parameters on the impact properties 311 The influence of temperature parameters is not affected by thermal deformation. The impact toughness measured from Fig. 2 can be seen at three points. Regularity: (1) The same tempering temperature, 920e preheating is higher than the impact toughness of the 940e preheated sample; (2) With the same preheating temperature, the impact toughness is also improved with the increase of tempering temperature, impact The toughness is also rising; (3) the parabolic law is satisfied between the impact toughness and the tempering temperature. Through curve fitting, the impact toughness of 920e and 940e preheating satisfies equations (1) and (2), respectively, where y is the impact toughness (J/cm2) and x is the tempering temperature (e). Impact toughness at different tempering temperatures y=-010628x2+501575x-980714y=010444x2+3614x-714112(340eFxF420e)(1), influence of thermal deformation parameters near the 920e preheating temperature, thermal deformation simulation according to thermal deformation specification Then, the impact toughness tested after tempering at different temperatures, the effect of the preheating temperature on the impact toughness after thermal deformation is not obvious, but the impact toughness decreases with the increase of tempering temperature. The impact toughness value and the tempering temperature remain parabolic, ie: y=-0108x2+5919x-10850(3)(380eFxF400e), the interaction between temperature parameters and thermal deformation parameters, tempering temperature is the key parameter affecting impact toughness. Whether or not thermal deformation will directly affect the change of impact toughness. The impact toughness of different tempering temperatures was compared under the preheating temperature of 920e without hot deformation and hot deformation. It can be seen that after thermal deformation, the impact toughness shows a stable zone near the tempering temperature 380e. The specific method is to obtain the tempering temperature of the intersection point by the simultaneous equations (1) and (3): y=-010628x2+501575x-980714y=-0108x2+5919x-10850(1)(3), which is x=38415e, corresponding The impact toughness was y = 354 J/cm 2 . If the point is used as the midpoint of the boundary zone and the tempering temperature is within the range of 3855e, the impact toughness value after thermal deformation fluctuates within the range of 35410 J/cm2, and the fluctuation error is within 3%. The actual 920e preheated by thermal deformation and the impact toughness of tempering at 380e was 360 J/cm2. The fracture was observed by SEM, and the dimple was mainly composed with a small facet. The toughness of the microstructure against impact was greatly increased. Analysis of test results and discussion The above test results show that both temperature parameters and thermal deformation parameters have an effect on the impact toughness of SAE9259 spring steel. The tempering temperature is a key control parameter that maintains a parabolic relationship of two polynomials between the impact toughness. In the absence of thermal deformation, the reduction in preheating temperature increases the impact toughness, which is related to the reduction of the initial austenite grain size. The increased grain boundary area increases the microscopic plastic deformation resistance, absorbs more uneven slip energy, and improves the impact toughness value. After thermal deformation, the newly added dislocation stress field, the solute atom and the precipitation have a large frictional resistance to the motion dislocation, far exceeding the strengthening effect of the fine crystal, so the preheating temperature related to the grain size at this time The change basically does not affect the impact toughness.
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