外加纳米陶瓷颗粒细化管线钢组织的评述
刘操
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作者单位：沈阳大学
中文关键字：管线钢；焊接热影响区； 非金属夹杂物；纳米颗粒
英文关键字： Pipeline；Heat affected zone； Non-metallic inclusions； Nano-particle
中文摘要：焊接热影响区（HAZ）晶粒粗大化问题是制约高级别管线钢优良力学性能有效发挥的关键。本文在提出非金属夹杂物细化晶粒基本理论的前提下，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的能在钢液中稳定存在的纳米颗粒，进而能够分布于基础相晶内或晶界之上，可望成为解决上述问题的一条有效途径。
英文摘要： Heat affected zone (HAZ) grain coarsening is the key that hinders the exertion of well mechanical properties of high-level pipeline steel effectively. In this paper, on the premise of the theory of grain refinement with non-metallic inclusions, two methods of the internal precipitation and the external addition which small second phase particles can be dispersed on steel matrix was discussed. As the non-metallic inclusions precipitating under the solid-phase line and the controlled rolling and cooling technique are not effective methods of solution of grain coarsening of pipeline steel welding heat affected zone(HAZ), and precipitation of non-metallic particle from liquid steel directly requires high quality of steel liquid and the size of particles were difficult to be controlled, it may get fixed to the above problem by the addition of nano-ceramics particles existing stably in liquid steel, and then can be dispersed to the austenitic matrix or its gain boundaries.