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引言近几十年来,世界各国在合金结构钢中,为了降低生产成本,普遍地降低了贵重合金元素如镍、铬、钼等的含量,而适当加入某些特殊合金元素.硼钢的发展,就是在这样要求下,广泛地应用起来的.在国外已有许多种硼钢用来制造汽车、飞机、拖拉机和机床等需要热处理的零件上.在1938年由于在炼钢过程中,应用含Al、 Ti、Zr、Ca等元素的复合脱氧剂,偶然发现淬透性热处理以后的强度和靱性的提高,进一步分析化学成份,发现钢中含硼,因而开始研究硼在钢中的效应.根据已知,当钢中加入0.0005-0.005%硼后,钢的
INTRODUCTION In recent decades, all the countries in the world have reduced the production cost and generally reduced the content of precious alloying elements, such as nickel, chromium and molybdenum, while adding certain special alloying elements as appropriate in the alloy steel. The development of boron steel, It is in such a request, widely used in many foreign countries have been used in the manufacture of boron steel for cars, aircraft, tractors and machine tools and other parts requiring heat treatment in 1938 due to the steelmaking process, the application of Al , Ti, Zr, Ca and other elements of the composite deoxidation agent, occasionally found hardenability after heat treatment and strength increase, further analysis of chemical composition, found in steel containing boron, and thus began to study the effect of boron in steel.According to Known when the steel after adding 0.0005-0.005% boron, steel