摘要
通过扫描电子显微镜、透射电子显微镜以及相应的力学性能测试,观察和分析了X100级管线钢塑性形变前后的微观组织及其韧性变化情况.结果表明:在相同的温度和时间条件下,随着应变量增加,针状铁素体和粒状贝氏体组织均发生形变,高密度位错在M/A岛周围积聚并形成亚晶界和晶界;形变后的晶粒变小,内部仍分布着许多亚晶界结构,且晶界的M/A组织和形变后组织内部缺陷降低了材料的冲击功;X100级管线钢在-34°C以内的应变时效敏感系数满足要求.
The effects of plastic deformation on the microstructure evolution and toughness properties of X100 pipeline structure steel were studied by scanning electron microscope（SEM）,transmission electron microscope（TEM） and mechanical test.The results show that both acicular ferrite and granular bainite change remarkably with the value of stress under the same aging temperature and time.Simultaneously,the high density dislocation agglomerates around the M/A island,forms the sub-grain boundary and the crystal boundary.After the deformation,the grain sizes decrease,while there are many sub-grain structures distributed in crystal,and the material impact toughness drops remarkably due to M/A constitution distributed on the crystal boundary and the deformation flaws.Correspondingly,the sensitive coefficient of strain-aging of grade X100 pipeline meets the needs when the temperature is above-34（°C）.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2011年第1期30-34,共5页
Journal of Shanghai Jiaotong University
基金
省部级重大专项基金项目(2008A-3005)
中国博士后基金资助项目(18420006)
关键词
管线钢
塑性形变
微观组织
M/A组织
pipeline steel
plastic deformation
microstructure
M/A constitution
