摘要
采用光学显微镜、扫描电镜及X射线荧光光谱仪,研究了65Mn钢冷轧带球化退火后的开平矫直过程脆断行为。结果表明:65Mn冷轧板730℃球化退火10~12 h后组织没有完全球化,具有粗大渗碳体片层结构的珠光体团。开平矫直过程中粗大的渗碳体板条受轧制力发生断裂或破碎。连铸坯粗大枝晶引起局部C、Mn元素偏析,贫C、贫Mn区珠光体相变温度升高,导致高于正常相变温度形成片层结构异常粗大的珠光体。将钢液过热度调低20℃,中间包钢水温度控制在1500~1510℃,能有效抑制粗大树枝晶的形成,避免此类缺陷的产生。
Brittle fracture behavior of 65Mn cold rolled strip steel in straightening process was researched by means of optical microscope, scanning electron microscope and X-ray fluorescence spectrometer. The results show that microstructure of the 65Mn cold rolled plate after spheroidizing annealing at 730 ℃ for 10-12 h is not fully spherical, and is pearlite cluster of coarse lamellar structure. In the straightening process, the coarse cementite lath is fractured or broken by the rolling force. Coarse dendrite in continuous casting slab induces local C, Mn element segregation, and the pearlite transformation temperature of Mn and C poor area is increased, which leads to higher than normal phase transition temperature, and the abnormally coarse lamellar structure cementite is formed. Reducing the superheat of molten steel of 20 ℃ and controlling ttmdish steel water temperature at 1500-1510 ℃ can effectively inhibit the formation of coarse dendritic crystals, which avoids the generation of such defects.
出处
《热加工工艺》
CSCD
北大核心
2017年第24期199-202,210,共5页
Hot Working Technology
基金
国家自然科学基金项目(51574107)
河北省自然科学基金项目(E2016209048)
唐山市科技创新团队培养计划资助项目(15130202C)
华北理工大学研究生创新项目(2016S26)
关键词
球化退火
解理断裂
渗碳体
成分偏析
spheroidizing annealing
cleavage fracture
cementite
composition segregation
