论文部分内容阅读
提出了非金属夹杂物细化晶粒的基本理论,论述了内部析出和外部加入两种在钢中形成细小第二相粒子的方法。由于目前常见的固相线以下形成的细小弥散的第二相非金属夹杂物颗粒或控轧控冷等技术均不能有效解决管线钢焊接热影响区(HAZ)晶粒粗大化问题,直接从液相中析出非金属夹杂物颗粒又有对钢液质量要求高和颗粒析出尺寸不易控制的问题。因此,采用适当的工艺向钢液中添加细小且能在钢液中稳定存在的纳米颗粒,分布于基础相晶内或晶界之上,可望成为解决上述问题的有效途径。
The basic theory of grain refinement of non-metallic inclusions was proposed. Two methods of forming fine second-phase particles in steel were discussed, including internal precipitation and external addition. Because of the common microstructure below the solid line formed by the second phase of small particles of non-metallic inclusions or controlled rolling and rolling control technology can effectively solve the pipeline heat-affected zone HAZ grain coarsening problem, directly from the liquid Phase precipitation of non-metallic inclusions particles have the high quality requirements of liquid steel and particle size is not easy to control the issue of precipitation. Therefore, the use of appropriate processes to the liquid steel to add small and stable in the molten steel nano-particles, distributed in the basic phase or above the grain boundaries, is expected to be an effective way to solve these problems.