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在普通高速钢材料中,加入适量硼来取代普通高速钢中价格昂贵的合金元素,设计了一种新型的高硼高速钢材料。研究了淬火温度对0.4%～0.5%C和1.0%～1.5%B的高硼高速钢显微组织的影响。结果表明,高硼高速钢的铸态组织由铁素体、珠光体和少量马氏体以及硼碳化合物组成,硼碳化合物由M23(B,C)6、(W,Mo)2(B,C),M3(B1.5,C0.5)和M(B0.7,C0.3)组成,呈网状和鱼骨状沿晶界分布。淬火处理后,基体组织转变成板条马氏体,含有4%残留奥氏体,硼碳化合物的类型没有发生变化,但数量减少。在950～1100℃内淬火,硼碳化合物局部发生溶解,出现断网现象;随着淬火温度的升高,断网现象越来越明显,从而减轻了对基体的割裂作用。
In common high-speed steel materials, adding appropriate amount of boron to replace the common high-speed steel in the expensive alloying elements, designed a new type of high boron steel high-speed materials. The effect of quenching temperature on the microstructure of high boron steel with 0.4% ~ 0.5% C and 1.0% ~ 1.5% B was studied. The results show that the as - cast microstructure of high boron steel is composed of ferrite, pearlite and a small amount of martensite and boron carbon compounds. The boron carbon compounds are composed of M23 (B, C) 6, (W, Mo) C), M3 (B1.5, C0.5) and M (B0.7, C0.3), and distributed in the reticular and fishbone along the grain boundaries. After quenching, the matrix structure transformed into lath martensite, containing 4% retained austenite, boron carbide type did not change, but the number decreased. In 950 ~ 1100 ℃ quenching, the partial decomposition of boron compounds occur, breaking phenomenon; with the quenching temperature increases, breaking phenomenon is more obvious, thus reducing the role of substrate rupture.