共查询到16条相似文献,搜索用时 50 毫秒
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研究了铸态ZK60镁合金拔长工艺,对锻造拔长过程的现象进行了分析,结果表明,通过光学显微镜对不同拔长工艺条件下的组织进行分析。随着锻造比的增大,晶粒组织逐渐细化,锻件力学性能提高。 相似文献
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通过采用多道次轧制技术,在300℃温度下,对ZK60镁合金进行了8道次不同轧制路径的实验研究(单向轧制、正交轧制、斜交轧制和组合轧制)。通过XRD衍射、金相观察、拉伸实验和断口形貌等分析,研究了不同轧制路径对ZK60镁合金组织和性能的影响。实验结果表明,通过多道次轧制后样品的晶粒都得到显著的细化,平均晶粒尺寸大约为5μm,力学性能得到显著提高。其中,斜交轧制路径能更有效地调控镁合金板材组织及其均匀性、弱化组织织构,提高材料的成型性能,其中延伸率大约为17.5%,抗拉强度是330 MPa。 相似文献
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对大应变轧制态ZK60镁合金进行350℃退火处理,研究了退火时间(0~3 h)对其显微组织、阻尼性能和力学性能的影响。结果表明:随着轧后退火时间由0延长到3 h, ZK60镁合金发生静态再结晶的程度增大,平均晶粒尺寸由6.86μm增大至23.35μm,位错密度由3.539 1×1015 m-2减小至1.336 8×1015 m-2,(0002)基面织构强度由12.782弱化至1.715,抗拉强度由309 MPa降低到291 MPa,断后伸长率由22.60%增大到28.60%。在应变振幅小于0.01时,轧后退火处理对合金阻尼性能的影响较小;在应变振幅大于0.01时,随着退火时间的延长,轧后退火态合金的阻尼性能提升。 相似文献
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在不同轧制速度(512,768,1 024 mm·s-1)下对均匀化退火态ZK60镁合金板进行4道次热轧,分别采用单向(4道次方向相同)和交叉(1,3道次方向与2,4道次方向垂直)2种轧制方式,研究了轧制方式和速度对镁合金板组织和力学性能的影响。结果表明:与单向轧制相比,交叉轧制镁合金板的组织均匀性和综合力学性能较好;随着轧制速度的增加,动态再结晶晶粒尺寸先减小后增大,抗拉强度先升后降,断后伸长率增大。在交叉轧制和768 mm·s-1的轧制速度下,ZK60镁合金板可获得良好的组织和力学性能,此时镁合金板已基本发生完全再结晶,晶粒细小均匀,抗拉强度为322.4 MPa,断后伸长率为15.7%。 相似文献
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Ball burnishing, a plastic deformation process, is becoming more popular as a finishing operation. A literature survey and discussion on the effects of the various types of burnishing (normal, vibratory and ultrasonic) and related parameters—force, speed, feed-rate, lubrication, ball material and diameter, workpiece material, pre-machined roughness and frequency of oscillation—on the final surface roughness are presented. The effect is an interaction between the process parameters with burnishing force and feed-rate as the two most significant factors. A particular surface finish can be obtained by appropriate selection of the parameters 相似文献
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Burnishing is a finishing manufacturing process that provides the required surface integrity of metal parts. Precise process simulation enables optimization to guarantee the quality of the product. A literature review showed that most researches in this field have used an idealized smooth surface for simulations and have not considered the influence of surface roughness on the simulation results. However, for burnishing processes, the initial roughness has a measurable effect on the simulation quality. Hence, an innovative approach for the preparation of the FEM process model was developed. The approach based on reverse engineering. Using 3D scanning, models of the workpiece and the tool were created and imported in the process model. The developed approach was validated through a case study. The results of the simulation with surface roughness demonstrate a better compatibility to the real process than the results of the same simulation on the idealized surface. Hence, using this approach, it is possible to create a precise model of the process and achieve more qualitative result of the burnishing simulations. 相似文献
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镁合金是目前最轻的金属结构材料,具有广阔的应用前景,但耐磨、耐蚀性差却制约着其广泛应用,可通过各种表面改性和表面涂覆技术拓宽其应用范围,介绍了镁合金的应用及其防护技术现状,重点介绍了冷喷涂技术在镁合金表面防护应用现状,分析了镁合金表面金属涂层的发展趋势,提出利用冷喷涂技术制备铝基非晶合金涂层,可望解决缺乏能为镁合金基体提供长效防护的单一涂层难题。 相似文献
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用机械合金化法制取Mo-8wt%Cu纳米复合粉末, 采用液相烧结和后处理工艺制备了全致密Mo-8wt%Cu合金. 通过扫描电镜对Mo-Cu液相烧结和变形加工后合金显微组织进行了分析, 研究了各种工艺参数对Mo-Cu合金致密性、 拉伸强度和延伸率的影响. 结果表明, 高能球磨的Mo-8wt%Cu纳米复合粉末坯体, 经液相烧结后, 其烧结态为Mo和Cu的复合网状组织, 在1 250 ℃烧结30 min, 可获得相对密度高达98.6%的Mo-Cu合金. 再经静液挤压和旋转锻造变形加工处理后, 可获得全致密的Mo-8wt%Cu合金. 在室温静液挤压40%形变率的条件下, 其拉伸强度可达576 MPa, 延伸率为5.8%. 相似文献
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