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用膨胀法和显微组织观察法,对硼在低碳-1/2钼钢相交中的作用进行了研究。 含硼30ppm以下的钢在930℃奥氏体化的情况下,出现最大的淬透性,但在更高温度奥氏体化时,淬透性要降低;含硼60ppm的钢,其淬透性不随奥氏体化温度而改变;含有95ppm的高硼钢,随奥氏体化温度增加至1130℃,仍增加其淬透性。这种特性可用硼的晶界偏聚和Fe_(23)(B,C)_6的析出解释。此外,还讨论了BN析出对淬透性的影响和Fe_(23)(B,C)_6的晶体学问题。
The effects of boron on the cross-over of low carbon-1/2 molybdenum steels were investigated by dilatometry and microstructure observation. Steel containing 30 ppm or less of boron shows maximum hardenability when austenitized at 930 ° C., but hardenability is reduced when austenitized at a higher temperature. Steel containing 60 ppm of boron is hardened Sex does not change with the austenitizing temperature; containing 95ppm high boron steel, with the austenitizing temperature increased to 1130 ℃, still increase its hardenability. This feature can be boron grain boundary segregation and Fe 23 (B, C) _6 precipitation explained. In addition, the influence of BN precipitation on the hardenability and the crystallographic problem of Fe_ (23) (B, C) _6 were also discussed.