工程科学学报2017，Vol.39Issue(6)：846-853,8.DOI:10.13374/j.issn2095-9389.2017.06.005
钛稀土复合处理对C--Mn钢粗晶热影响区组织及韧性的影响
Influence of Ti-rare earth addition on microstructure and toughness of coarse grain heat-affected zone in C--Mn steel
摘要
Abstract
The influences of rare earth ( RE) and Ti- RE complex treatment on the microstructures and toughness in the coarse grain heat-affected zone (CGHAZ) of C-Mn steel were investigated using a Gleeble-1500D thermal simulator with input heat energy of 65 kJ·cm-1 . The inclusions and impact fracture morphology were observed and analyzed by scanning electron microscopy ( SEM) and energy-dispersive X-ray ( EDX) , and the microstructure was characterized using an optical microscope ( OM) . The results show that the microstructures in the CGHAZs of RE- and Ti-RE-treated samples are mainly grain boundary ferrite ( GBF) + polygonal fer-rite ( PF) + intragranular acicular ferrite ( IAF) and grain boundary ferrite + intragranular acicular ferrite, respectively. Inclusions in the RE-treated specimen are La2 O2 S + Mn-Al-Si-O + MnS, while those in the Ti-RE-treated specimen are La2 O2 S + TiOx +Mn- Al-Si-O + MnS. The complex inclusions in Ti-RE-treated steel are smaller than those in RE-treated steel, and the size of IAF in Ti-RE-treated steel is smaller. The impact properties of the CGHAZ in Ti-RE-treated C-Mn steel is improved significantly, and the material is tougher than RE-treated steel.关键词
碳-锰钢/粗晶热影响区/针状铁素体/显微组织/冲击韧性Key words
carbon-manganese steel/coarse grain heat-affected zone ( CGHAZ)/acicular ferrite ( AF)/microstructure/impact toughness分类
矿业与冶金引用本文复制引用
张圣华,宋波,宋明明,高启瑞..钛稀土复合处理对C--Mn钢粗晶热影响区组织及韧性的影响[J].工程科学学报,2017,39(6):846-853,8.基金项目
国家自然科学基金资助项目(51274269) （51274269）
