摘要
研究了终轧温度对Q420qE钢板组织性能的影响。结果表明：采用控轧＋弛豫＋控冷工艺可以获得铁素体＋贝氏体双相组织;终轧温度越高,铁素体晶粒尺寸越大,钢板屈强比越低,但冲击韧性也随之降低。当终轧温度为860℃时,钢板屈强比和韧性达到较佳匹配,此时钢板厚度1/4处和芯部未发生铁素体相变的奥氏体发生了贝氏体相变;终轧温度为880℃时,钢板芯部发生了上贝氏体转变,冲击韧性明显降低。
The effects of finishing rolling temperature on microstructure and mechanical properties of Q420qE plate were studied.The results indicate that ferrite＋bainite dual phase structure is obtained by the processing of controlled rolling＋relaxation＋controlled cooling.With rising of finishing rolling temperature,the size of ferrite is larger,which leads to lower yield ratio and impact toughness.When the finish rolling temperature is 860℃,the combination of yield ratio and impact toughness is perfect.The part of austenitic has not been transformed into ferrite,but transform into bainite at the 1/4 thickness and center.When the finish rolling temperature is 880 ℃,the tupper bainite is formed at the center,which will obviously reduce the impact toughness.
作者
韩承良
王彦锋
杨永达
黄乐庆
王锁涛
HAN Cheng-liang1 , WANG Yan-feng2, YANG Yong-da2 , HUANG Le-qing2, WANG Suo-tao1(1. Qinhuangdao Shouqin Metal Materials Co. , Ltd. , Qinhuangdao 066326, China; 2. Research Institute of Technology, Shougang Group Co. , Ltd. ,Beijing 100043 ,Chin)
出处
《轧钢》
2018年第2期26-28,共3页
Steel Rolling
关键词
终轧温度
屈强比
弛豫
晶粒尺寸
针状铁素体
finishing rolling temperature
yield ratio
relaxation
grain size
acicular ferrite
