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本文研究了不同硼含量下FeCrMoSiB单辊急冷带及950℃退火带的显微组织及硬度和脆性。发现在B≤17％范围内,硼含量的增加提高非晶形成能力及抗晶化能力,但同时也增加其脆化倾向,非晶内部存在成分与结构的不均匀性。当B=20％时,非晶形成能力急剧下降,生成与(Cr,Fe)_2B结构相近的亚稳相。退火带由硼化物与α-Fe晶粒组成。硼化物有M_3B_2和(Cr,Fe)_2B两种,其中(Cr,Fe)_2B数量随硼含量线性增加而M_3B_2数量基本不变。
In this paper, the microstructure and hardness and brittleness of FeCrMoSiB single-roll quenching zone and 950 ℃ annealing zone with different boron contents were studied. It was found that in the range of B≤17%, the increase of boron content improves the ability of amorphous formation and crystallization resistance, but also increases the tendency of embrittlement and the non-uniformity of the composition and structure of the amorphous interior. When B = 20%, the amorphous formation abruptly decreases, forming a metastable phase close to (Cr, Fe) _2B. Annealing belt from the boride and α-Fe grains. There are two kinds of borides, M_3B_2 and (Cr, Fe) _2B, in which the amount of (Cr, Fe) _2B increases linearly with the content of boron while the amount of M_3B_2 remains unchanged.