摘要
采用电化学充氢和慢拉伸应变速率实验(SSRT)研究了形变和时效处理对一种低碳-Mn-B-Ti系贝氏体型冷作强化非调质钢氢致延迟断裂行为的影响规律。结果表明,无论热轧态还是拉拔态试样,充氢后试样的耐延迟断裂性能显著降低。在拉拔变形初期,减面率γ<20%时,耐延迟断裂性能降低的幅度较大;而随着拉拔量的继续增加,耐延迟断裂性能降低的趋势变缓。实验料拉拔后进行时效处理有助于其耐延迟断裂性能的改善,当时效温度提高到200℃以上时这种改善作用比较明显。
The hydrogen induced delayed fracture behavior of a newly developed low carbon Mn-B-Ti type cold hardening microalloyed bainitic steel was studied using electrochemical charging and slow strain rate test（SSRT）.It is found that charging of hydrogen significantly impairs the delayed fracture property of specimen both at as-hot rolled and as-cold drawn conditions.The decrease of anti-delayed fracture property is more noticeable when cold drawing reduction γ is lower than 20%.However,aging treatment has a beneficial effect on improving the anti-delayed fracture property of cold drawn specimen,and this improvement is more noticeable when aging temperature is higher than 200℃.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2012年第3期47-51,共5页
Journal of Materials Engineering
基金
国家科技支撑计划资助项目(2007BAE30B04)
南京工程学院基金项目(KXJ08135)
江苏省高校科研成果产业化推进项目(JHB2011-25)
关键词
延迟断裂
贝氏体型冷作强化非调质钢
冷变形
时效处理
氢陷阱
delayed fracture
cold-hardening microalloyed bainitic steel
cold deformation
aging treatment
hydrogen trapping
