结构钢加热过程中奥氏体晶粒长大模型及应用  

Austenite Grain Growth Model and Application in Heating Process of Structural Steel

作　　者：梁博[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《热加工工艺》2013年第22期80-82,共3页Hot Working Technology

摘　　要：Sellar、Hillert模型常用来描述加热温度与奥氏体晶粒尺寸关系,而Beck模型用于描述保温时间与奥氏体晶粒尺寸关系。采用金相分析法研究了V、Nb微合金结构钢在不同加热温度下奥氏体晶粒长大的规律,并应用Hillert模型建立了这种结构钢的奥氏体晶粒长大模型。结果表明V、Nb微合金结构钢在850～1050℃随加热温度升高,奥氏体晶粒尺寸逐渐增加。低于950℃时,奥氏体晶粒尺寸增加趋势较为平缓;950～1000℃晶粒长大速率最快;温度继续提高,长大趋势趋于平稳。由Hillert模型得到奥氏体晶粒长大动力学方程,晶粒长大激活能Q=19 kJ/mol。Sellar model and Hillert model were commonly used to describe the relationship between heating temperature and austenite grain size, while Beck model was used to describe the relationship between holding time and austenite grain size. A austenite grain growth behavior of V, Nb micro-alloyed structmal steel at different heating temperatures were investigated by metallographic observation, and the austenite grain growth model was established by applying Hillert model. The results show that： the austenite grain size of V, Nb microalloyed structural steel gradually increases with heating temperature at 850-1050 ℃. Less than 950 ℃, the austenite grain size increasing trend is gentler; the grain growth rate is fastest between 950 and 1000 ℃ ; the growing up trend is stabilized as increasing temperature. The anstenite grain kinetic equation is established by Hillert model, and the grain growth activation energy Q is 19 kJ/mol.

关 键 词：结构钢 奥氏体晶粒 长大动力学 

分 类 号：TG142.1[一般工业技术—材料科学与工程]