The presented work was aimed at evaluating influence of boron on hardenability of steel quantitatively and evaluating this effect during complex use of boron with other alloying additives like chromium, vanadium and titanium. For this purpose, eight melts with variable chemical compositions were prepared. From the ingots, cylindrical specimens with normalized dimensions according to EN ISO 642:1999 were cut out and subjected to full annealing at 1200 °C and to normalizing at 900 °C. Such specimens were subjected to the hardenability Jominy test. In order to distinguish the influence of boron on hardenability of a given melt and thus to eliminate the differences resulting from its chemical composition, grain size and austenitizing temperature, the obtained ideal critical diameter was corrected and the boron effectiveness factor was determined. The performed examinations and analyses showed that inadequate quantities of microadditives result in losing the benefits coming from introduction of boron as the hardenability-improving element and can even result in a reduction of hardenability of the boron-containing steel.

中文翻译：

---

合金添加剂和微添加剂对硼作用引起的淬透性增加的影响

提出的工作旨在定量评估硼对钢的淬透性的影响，并评估硼与其他合金添加剂（如铬，钒和钛）复合使用时的这种效果。为此，制备了具有可变化学组成的八个熔体。从铸锭上切下符合EN ISO 642：1999标准尺寸的圆柱试样，并在1200°C的温度下进行完全退火，然后在900°C的温度下进行归一化处理。对这些样品进行可淬性Jominy测试。为了区分硼对给定熔体的淬透性的影响，从而消除因其化学成分，晶粒尺寸和奥氏体化温度而引起的差异，对获得的理想临界直径进行了校正，并确定了硼有效性因子。