摘要
在600～1350℃对X70管线钢进行了拉伸试验,通过扫描电镜和金相显微镜展示了不同温度区断口的组织形貌,并研究了C、N含量对试样面缩率的影响。结果表明,700～900℃为X70钢的第三脆性区,面缩率低于40%。随着C、N含量的增加,1000～1250℃高温塑性区的塑性呈下降趋势,但对第三脆性区的塑性却略有改善作用,这与Nb、V等合金元素的碳氮化合物在晶界析出所产生的钉扎作用有一定关系。
Tensile testing for X70 pipeline steels in 600～1 350 ℃ was carried out, and the fracture micrographs of samples in different temperature were examined with SEM and metallographic microscope. The effects of C, N content on area reduction (RA) were examined. The results show 700～900 ℃ is the embrittlement region III, where the RA is lower than 40%. The plasticity decreases in 1 000～1 250 ℃ with the increase of C and N, while the plasticity is improved slightly in region III. It's the contribution of pinning function of carbonitride of Nb, V precipitated in grain boundary.
出处
《钢铁钒钛》
CAS
北大核心
2004年第4期37-41,共5页
Iron Steel Vanadium Titanium
关键词
X70管线钢
连铸
延塑性
X70 pipeline steel
continuous casting
plasticity
