研究表明,高速钢淬火回火后的抗弯强度随淬火加热温度的提高而降低(图1)。这与碳和合金元素在奥氏体中的饱和程度有关,以及与晶粒大小及晶界构造有关。当碳化物网沿晶界形成时,高速钢的抗弯强度剧烈下降。在绝大多数炉号P18高速 The research shows that the flexural strength of high-speed steel after quenching and tempering decreases with the increase of quenching temperature (Fig. 1). This is related to the degree of saturation of carbon and alloying elements in the austenite, as well as grain size and grain boundary structure. When the carbide network is formed along the grain boundaries, the bending strength of high-speed steel decreases sharply. P18 high speed in most furnaces