Y.X. Hu
,
Z.Q. Yao
金属学报(英文版)
Finite element method is presented to attain the numerical simulation of residual stresses field in the material treated by laser shock processing. The distribution of residual stresses generated by single laser shock with square and round laser spot is predicted and validated by experimental results. With the FEM model, effects of different overlapping rates and impact sequences on the residual stresses distribution are simulated. And the results indicate that: (1) Overlapping laser shock can increase the compressive residual stresses. But it is not effective on the growth of plastically affected depth; (2) Overlapping rate should be optimized and selected carefully for the large area treatment. Appropriate overlapping rate is beneficial to obtain a homogeneous residual stress field; (3) Impact sequence has a great effect on the residual stress field. It can greatly attenuate the phenomenon of “residual stress hole” to obtain a homogeneous residual stress field.
关键词:
Laser shock processing
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null
,
null
,
null
H. Shen*
,
Z.Q. Yao
金属学报(英文版)
A mathematical model was established for the temperature field developed during high frequency induction heating (HFIH) by Maxwell's equations. It required solving the coupled equations of the electromagnetic and temperature fields. The numerical simulation was performed using FEMLAB. The comparison of the calculations using the proposed model with experimental results showed a very good correlation. The effects of the heating parameters in high frequency induction such as the distance between the plate and the coil, the applied current, the frequency, and the turns of the coil on the temperature profiles developed in the plate were also discussed using the established model.
关键词:
high frequency induction
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null
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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
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特厚板
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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
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z向性能
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不合
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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
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成分设计
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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
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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
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特厚钢板
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控制轧制
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Z向性能
