Preparation method of Cr8 die steel with high wear resistance and long fatigue life

• Main Authors: YAMAIZUMI, HUANG XIEDONG, FU HAO, CHEN PENG
• Format: Patent
• Language: Chinese; English
• Published: 10.10.2023
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a preparation method of Cr8 die steel with high wear resistance and long fatigue life, and belongs to the technical field of metal die steel. According to the preparation method of the Cr8 die steel with high wear resistance and long fatigue life, through deformation design and a heat treatment process, the preparation method comprises the steps of smelting, pouring, forging treatment, rolling, cyclic heat treatment, tempering treatment, carbide precipitation regulation and control on steel, cyclic heat treatment for refining original austenite grains, tempering secondary hardening and the like. The Cr8 die steel has high wear resistance and long fatigue life, the wear resistance is improved by about 3 times, the fatigue life is prolonged by 10 times, and the fatigue frequency can reach 300,000 times under the amplitude of 20%. 本发明公开了一种高耐磨性高疲劳寿命的Cr8模具钢的制备方法，属于金属模具钢技术领域。本发明所述高耐磨性高疲劳寿命的Cr8模具钢的制备方法通过设计变形及热处理工艺，包括熔炼、浇注、锻造处理、轧制、循环热处理、回火处理，对钢材进行碳化物析出调控、循环热处理细化原奥晶粒、回火二次硬化等，使Cr8模具钢获得高耐磨性高疲劳寿命，