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目前使用的热压模钢,大多是含有一定数量残余碳化物的二次硬化钢,工作条件比较苛刻,要求具有高的强度、韧性、热稳定性及热疲劳抗力。虽然已经提出了一些强韧化处理方法,如高温淬火——高温回火法、低温淬火法等等,但是这些方法都不能全面地提高上述性能,只适合于某些特定的场合。因此,在二次硬化热模钢的强韧化处理方法上还需要作进一步的发展与研究。我们根据对这类钢的组织-性能关系研究的结果,提出了一种新的强韧化处理方法——双重处理法。对几种具有代表性热模钢的试验结果表明,这种方法能比较全面地、较大幅度地提高钢的实验室性能指标,同时在实际生产的初步应用中也取得了较好的结果。
Currently used hot stamping die steel, mostly containing a certain amount of residual carbide secondary hardening steel, the working conditions are harsh, requiring high strength, toughness, thermal stability and thermal fatigue resistance. Although some toughening treatments have been proposed, such as high temperature quenching - high temperature tempering, cryogenic quenching, etc., these methods do not fully improve these properties and are only suitable for certain applications. Therefore, it is necessary to further develop and study the method of strengthening and toughening the secondary hardening hot mold steel. Based on the study of the organization-property relationship of this type of steel, we propose a new method of toughening - the double treatment. The test results of several representative hot die steels show that this method can improve the laboratory performance index of steel more comprehensively and greatly and achieve better results in the initial application of the actual production.