ABSTRACT

The work was aimed at analysing the effect of boron on austenite grain size of low-alloy cast steels during austenitization in the range between 850°C and 1200°C. The effect of boron was investigated in presence of other alloying additives: chromium, vanadium and titanium. Eight melts with various chemical compositions were subjected to heat treatment started from soaking at eight different temperatures. After quenching, former austenite grain size was determined by a method of quantitative metallography. Influence of boron on austenite grain size, especially in presence of other alloying elements, was evaluated by one-way variance analysis ANOVA and the Kruskal–Wallis tests. The analyses showed a significant influence of boron on austenite grain size, which can be compensated by alloying elements creating stable carbides and nitrides.

摘要

该工作旨在分析硼对低合金铸钢在 850°C 至 1200°C 范围内奥氏体化过程中奥氏体晶粒尺寸的影响。在其他合金添加剂的存在下研究了硼的影响：铬、钒和钛。从在八种不同温度下均热开始，对具有不同化学成分的八种熔体进行热处理。淬火后，原奥氏体晶粒尺寸通过定量金相法测定。通过单向方差分析 ANOVA 和 Kruskal-Wallis 测试评估硼对奥氏体晶粒尺寸的影响，尤其是在存在其他合金元素的情况下。分析表明硼对奥氏体晶粒尺寸有显着影响，这可以通过合金元素产生稳定的碳化物和氮化物来补偿。