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本文对40MnB等钢进行了硼相的金相观察,试验了硼相的变化及其对硼钢性能的影响;讨论了硼相的含义和未能完全溶解的看法;讨论了碳含量、硼相与性能和酸溶硼的关系。试验结果表明:可以用不同侵蚀剂对基体不同作用与染色的特点,以检验硼相的存在、分布和形态;硼相的数量、大小和网状分布,随钢中硼量增加、奥氏体化温度提高、冷却速度减慢而增多,因而使冲击韧性降低。但经940℃正火改善其状态,则可改善韧性,继续提高到1200℃和1300℃反而恶化。硼量对淬透性的影响表明,硼控制在0.002%左右较好。奥氏体化温度与淬透性的关系曲线具有两个拐点,而以950℃较为合适。酸溶硼与含碳量成曲线反比、与冲击韧性和硼相网状分布有关。对于硼钢尚有许多工作亟需进行,以提高钢材和零件的质量。
In this paper, 40MnB and other steel was observed by metallography of boron phase, the change of boron phase and its effect on the properties of boron steel were studied. The meaning of boron phase and the incomplete dissolution were discussed. The effects of carbon content, boron phase Relationship with performance and soluble boron. The experimental results show that the presence, distribution and morphology of boron phases can be tested by different corrosive agents’ different effects on the matrix and the dyeing behavior. The number, size and reticular distribution of boron phases, with the increase of boron content in steel, As the temperature increases, the cooling rate decreases and the impact toughness decreases. However, normalizing at 940 ℃ to improve its state, can improve the toughness, continue to increase to 1200 ℃ and 1300 ℃ but worse. The influence of boron content on hardenability shows that it is better to control boron at about 0.002%. The relationship between austenitizing temperature and hardenability curve has two inflection points, and 950 ° C is more suitable. Acid soluble boron and carbon content is inversely proportional to the curve, and impact toughness and boron phase network distribution. Much work remains to be done on boron steel to improve the quality of steel and parts.