Thermomechanical Processing Map in Retaining {100}//ND texture via Strain-Induced Boundary Migration Recrystallization Mechanism
Thermomechanical Processing Map in Retaining {100}//ND texture via Strain-Induced Boundary Migration Recrystallization Mechanism
复制标题
DOI：
10.1007/s11661-020-06047-x
复制
发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
M. Ji;C. Slater;C. Davis
中科院分区：
文献类型：
--
作者：
M. Ji;C. Slater;C. Davis
研究了在非晶粒取向（NGO）电工钢中建立促进{100}//ND纤维织构-应变诱导的边界迁移（SIBM）再结晶机制的热力学条件的可行性。在不同温度和应变下对Fe-6 wt - pt - Si进行了单轴单击压缩，建立了储存能量与软化机制之间的关系。根据储存的能量水平，观察到仅通过SIBM或亚晶生长（SGG）进行恢复和再结晶。具有很强的{100}//ND纤维再结晶织构，即在650°C下变形到0.2应变，然后在1000°C退火15分钟，样品的面积分数为45%，而在500°C下变形到0.4应变，然后进行相同的退火处理，只观察到13%的{100}//ND纤维成分。通过对aebsd退火前后同一组织区域的观察，发现{100}//ND织构再结晶晶粒在{100}//ND织构变形基体附近形成。低贮存能有利于{100}//ND织构再结晶晶粒的形成，其再结晶成核速率较慢。变形研究的结果已被用于提出一个处理窗口图概念，以定义开始铸态柱状组织的恢复、SIBM和SGG区域。
The feasibility of establishing thermomechanical conditions to promote {100}//ND fiber textureviastrain-induced boundary migration (SIBM) recrystallization mechanism in a non-grain oriented (NGO) electrical steel was investigated. Single-hit uniaxial compression at various temperatures and strains has been applied on Fe-6 wt pct Si to establish the relationship between stored energy and the softening mechanisms. Recovery only and recrystallization by SIBM or by subgrain growth (SGG) have been observed depending on the stored energy level. A strong {100}//ND fiber recrystallization texture,i.e., 45 pct area fraction, was seen in the sample which was deformed to 0.2 strain at 650 °C and then annealed at 1000 °C for 15 minutes, whereas only 13 pct {100}//ND fiber component was observed after 0.4 strain at 500 °C followed by the same annealing treatment. By examining the same microstructural region before and after annealingviaEBSD, it has been shown that {100}//ND textured recrystallized grains were formed adjacent to the {100}// ND textured deformed matrix. Low stored energy has been shown to favor the formation of {100}//ND texture recrystallized grainsviaSIBM recrystallization mechanism attributed to its slow recrystallization nucleation rate. The results from the deformation studies have been used to suggest a processing window map concept to define the recovery, SIBM, and SGG regions for the starting as-cast columnar microstructure.