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塑性较低是传统马氏体钢热成形件的缺点之一。本文采用上模具水冷,下模具带温(200℃)的思路进行热成形试验,检测了热成形过程中的温度曲线和热成形件的微观组织和力学性能。结果表明,工件的冷却速度随模具温度的升高而降低,采用带温模具进行热成形,能够满足工件淬透性要求,获得全马氏体组织;还有利于提高工件的自回火能力,从而提高工件的屈服强度;同时,相对较低的冷却速度减小了钢的淬火内应力,使热成形件的塑性和强塑积得到明显提高。
Low plasticity is one of the shortcomings of the traditional thermoformed martensitic steel. In this paper, the mold on the water, the mold with a temperature (200 ℃) ideas thermoforming test to detect the thermoforming process temperature curve and thermoforming of the microstructure and mechanical properties. The results show that the cooling rate of the workpiece decreases with the increase of the mold temperature, and the hot forming with the mold with the temperature can meet the requirements of the hardenability of the workpiece to obtain the whole martensitic structure. It is also beneficial to improve the self-tempering capability of the workpiece, Thereby increasing the yield strength of the workpiece; the same time, a relatively low cooling rate reduces the internal quenching stress of steel, so that the plastic parts of the thermoformed and plastic products have been significantly improved.