摘要
Al-Mn-Si-Ti多元合金是一种用于炼钢脱氧与合金化的新型中间合金,前期试验制备的该类系列合金存在自然粉化现象。利用扫描电镜(SEM)和X线衍射仪(XRD)等检测分析表明:合金凝固过程发生γ(Mn)→β(Mn)晶型转变和ζ相FeSi2的生成,二者伴随着较大的体积变化,致使合金内部相邻组织单元之间应力变化导致前期微裂纹的产生。当合金处于潮湿环境中,合金中Al的磷化物、碳化物夹杂发生水解,与前期微裂纹之间进一步相互作用,最终导致合金自然粉化解体。实验证明,在合金熔炼过程中加入足量的Ti可以生成稳定的TiP和TiC代替不稳定的AlP和Al4C3,有效降低合金的粉化。
A1-Mn-Si-Ti alloys were used for deoxidation and alloying in the steelmaking process. Natural cracks and disintegration were usually found in this type of new alloys in the previous experiments. A series of SEM and XRD analysis were performed to show that the pulverization mechanism of the alloys is the result of the interaction between the microcracks and the hydrolysis. The microcracks are caused by the crystal volume change both in the r,（Mn）→fl（Mn） crystal transformation and the generation of ξphase FeSi2. Hydrolysis occurs when the alloys with phosphide or carbide impurities are exposed in the moisture environment. It will then interact with the microcracks, which leads to the natural disintegration of the alloys. It is also demonstrated experimentally that adding enough amount of Ti during the preparation process can reduce the alloy crumbling rate effectively by combining P and C to generate stable TiP and TiC, while unstable AlP and A14C3 can be avoided.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第12期4688-4693,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51174244)
国家高技术研究发展计划('863'计划)项目(2008AA031203)
关键词
Al-Mn-Si-Ti合金
裂纹源
晶型转变
水解
粉化机理
A1-Mn-Si-Ti alloy
crumbling origin
crystal transformation
hydrolysis
spontaneous crumblingmechanism
