机构地区: 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室
出 处: 《东北大学学报(自然科学版)》 2002年第10期972-975,共4页
摘 要: 以碳 (质量分数 ) 0 0 5 7% ,锰 (质量分数 ) 0 91%的低碳钢为研究对象 ,在Gleeble 15 0 0热模拟实验机上利用喷水淬火法确定了应变诱导相变发生的上限温度Ad3·根据热变形过程中组织变化的主要过程将低碳钢的控制轧制分为 3个阶段 :Ad3以上、Ar3~Ad3之间以及Ar3以下·在 3个温度范围内进行了不同参数的压缩实验 ,通过组织分析研究了变形过程中的组织变化·结果表明 ,在Ad3以上 ,变形过程中主要发生奥氏体的动态再结晶过程 ;Ar3~Ad3之间 ,变形过程中有应变诱导铁素体析出 ,且随着变形温度的降低、变形量的增加及变形速率的降低 ,铁素体量增加 ;在Ar3以下 ,先共析铁素体发生动态再结晶 ,奥氏体晶界和晶内有大量铁素体析出· The single pass experiments with different deformation parameters were carried out in different temperature ranges, and the microstructural evolution in different temperature range was investigated. According to the microstructural evolution during deformation, the control rolling of low carbon steel was suggested to divide into three stages: above A d3 ,A r3 ~A d3 , below A r3 . The results indicate that the dynamic recovery and dynamic recrystallization occurred during deformation above A d3 ; in the temperature of A r3 ~A d3 , the ferrite could precipitate during deformation and the ferrite amount increases as deformation temperature decreases, strain value increases and strain rate decreases; in the temperature below A r3 , proeutctiod ferrite dynamic recrystallization occurred and large amount ferrite precipitated along the austenite grain boundaries and intragranular.
关 键 词: 低碳钢 应变诱导相变 控制轧制 组织变化 铁素体
领 域: [金属学及工艺]