D.G. Ren
,
Z.Q. Li
,
X.S. Fan and J. T. Guo Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China
金属学报(英文版)
By using AP-FIM the varity of the ordered degree of Ni_3Al with L1_2 structure with B content was studied. The possibility of boron improving ductility was also discussed from bonding between Ni and Al atoms, and antisite defects in Ni_3Al. The extent of ordering is reduced with an increase in boron content and the autisite defects are most obvious for 0.52at.K B-doped sample that has the best ductility. Some results were verified by X-ray diffraction non. The addition of boron not only influences electron environment at grain boundary but also in the interior of Ni_3Al gm ins, the latter is favorable to improve the ductility of Ni_3Al grains.
关键词:
intermetallic compound
,
null
,
null
J.W. Zhao
,
H. Ding
,
W.J.Zhao
,
F.R. Cao
,
H.L. Hou
,
Z.Q. Li
金属学报(英文版)
A cellular automaton (CA) model is established to
simulate dynamic recrystallization (DRX) in the $\beta$ single-phase
field of Ti6Al4V alloy, and the kinetics during DRX processing has
been analyzed. The model employed considers the influences of
dynamic recovery, nucleation rate, strain rate and dislocation
density on DRX, and practical deformation parameters, such as
temperature, strain and strain rate on DRX have been considered in
the simulation. The simulated DRX grain size and DRX grain shape
agree well with the experimental results, which shows the
availability and feasibility of the cellular automaton method for
the simulation of DRX. The result of kinetics analysis of DRX
reveals that the Avrami exponent is variable ranging from 2.4 to
2.9, which increases with the increase of strain rate.
关键词:
Ti6Al4V alloy
,
null
,
null
,
null
,
null
,
null
张强
,
许少普
,
李忠波
,
唐郑磊
,
高照海
,
杨阳
钢铁
doi:10.13228/j.boyuan.issn1001-0963.20150135
采用横截面为350mm×2 320 mm的钢坯轧制横截面为100 mm×2 360 mm的Q345E-Z35.在粗轧阶段以高于动态再结晶临界变形量和形状系数l/h≥0.53的条件下,经过不同的终轧温度和返红温度试验,最终确定精轧阶段终轧温度控制在780℃左右,返红温度控制在610℃左右,生产出的钢板具有优异的力学性能和层状撕裂抗性.
关键词:
Q345E-Z35
,
特厚板
,
控轧控冷
朱书成
钢铁研究学报
采用高倍金相检验、扫描电镜及能谱分析等方法对120mm Q390GJC-Z35特厚板的z向性能不合缺陷进行了研究。结果表明：z向性能不合主要是由于钢锭存在着较严重的中心偏析,在不合试样断口处存在着较多的块状（Nb、Ti）C聚集,块状的（Nb、Ti）C成为裂纹源。此外,偏析处还存在贝氏体等硬相组织,更加剧了断裂扩展,导致z向性能不合。通过优化成分设计,加强精炼过程控制,改进模铸浇注工艺,制定合理热处理工艺等相关措施,取得了良好的效果。
关键词:
Q390GJC-Z35
,
z向性能
,
不合
,
原因分析
,
措施
唐郑磊
,
张涛
,
杨东
,
李红洋
,
徐昭
,
庞林
钢铁研究
通过成分设计、轧制、热处理工艺设计,采用晶粒细化、固溶强化、析出强化等手段,对80、110mm的Q460GJC-Z35高强度钢板的研发工艺及过程进行试验设计。结果表明：通过Nb、V、Ti、Ni复合微合金化和控轧控冷、正火快冷（NAC）热处理相结合生产的模铸Q460GJE-Z35钢板具有晶粒细小、组织均匀,钢板屈服强度达到420~490 MPa,抗拉强度达到585~625 MPa,伸长率达到20%以上,0℃冲击功达到123 J以上,Z向断面收缩率大于35%,探伤达到1级探伤要求,实现了强度和韧性的良好匹配和较高的内部质量。
关键词:
Q460GJC-Z35
,
成分设计
,
热处理工艺设计
唐郑磊
,
张涛
,
杨东
,
李红洋
,
徐昭
,
庞琳
钢铁
在生产试验的条件下,通过成分设计和轧制、热处理工艺设计,采用晶粒细化、固溶强化、析出强化等手段,对80、110、120mm厚的Q460GJE-Z35高强度钢板的研发工艺及过程进行了试验研究。结果表明：通过铌、钒、钛、镍复合微合金化和控轧控冷、正火快冷（NAC）热处理相结合生产的模铸Q460GJE-Z35钢板晶粒细小、组织均匀,强度和韧性匹配良好、内部质量较优。
关键词:
Q460GJE-Z35钢板
,
成分设计
,
正火加速冷却
朱书成
,
于飒
,
高照海
,
李忠波
,
袁永旗
钢铁
利用250mm连铸坯料,在3 800mm宽厚板轧机上针对Q345GJC-Z35钢种进行了厚50～80mm钢板的TMCP工艺试验,确定了相应的热轧及控冷工艺条件。结果表明：采用碳的质量分数低于0.11%添加微量复合铌、钒、钛元素,按照2阶段控制,当轧到成品钢板厚度的2～3倍时开始待温,精轧开轧温度小于860℃,终轧温度为820～860℃,生产的Q345GJC-Z35高强度厚板的性能完全超出国家标准GB19879—2005要求,而且其钢板的平均断面收缩率都大于50%,远高于Z35钢板的技术要求。实现了钢板很好的强韧性匹配,工艺上不用后续热处理,减少了工艺流程,节约了成本。
关键词:
Q345GJC-Z35钢
,
特厚钢板
,
控制轧制
,
Z向性能
