论文部分内容阅读
在生产中,我们对一批直径8毫米,长度175～370毫米的轧制圆钢(毛坯)进行淬火回火处理,零件在30千瓦的电炉中加热(温度840～860℃),加热后在油中淬火,淬火后的硬度往往偏低(一般小于HRC45),水中淬火后HRC可达58～59,淬火组织为细小的马氏体,但淬裂百分比很大,经过多批试淬,几乎百分之百的开裂,在零件上形成纵向深裂纹,如图1a、b所示。裂纹长度占零件长度的30～70%,最
In production, we quenched and tempered a group of rolled round bars (blanks) with a diameter of 8 mm and a length of 175 to 370 mm. The parts were heated in a 30-kilowatt electric furnace at a temperature of 840 to 860 ° C. After heating, Oil quenching, the hardness after quenching tend to be low (generally less than HRC45), HRC up to 58-59 quenching in water, the quenched microstructure of fine martensite, but a large percentage of quench cracking, after several batches of quenching, almost One hundred percent cracking creates a longitudinal deep crack in the part, as shown in Figure 1a, b. Crack length of the part length of 30 to 70%, the most