共查询到19条相似文献,搜索用时 203 毫秒
1.
对TA2薄壁钛焊管在线感应退火工艺进行了研究,分析在线感应退火工艺对TA2钛焊管的组织和性能的影响,以及同一退火温度、不同成型焊接速度对焊管性能的影响。进行了焊接速度2.8 m/min下未退火和600℃退火,以及焊接速度2.8 m/min、4.6 m/min、6.1 m/min下580℃退火实验。比较分析了同一焊接速度下,未退火和退火的拉伸性能指标变化,以及同一退火温度下不同焊接速度下管材的拉伸性能变化情况。结果表明,对薄壁纯钛焊管进行在线感应退火,可明显提高了管材的塑性,有效降低管材的内应力;退火工艺的选择需考虑焊接速度,同一退火温度下,焊接速度越快,则保温时间越短,管材的屈服强度越高,延伸率下降。 相似文献
2.
3.
4.
采用冷轧复合法制备钛/钢层状复合板,研究轧制压下率、轧制道次、表面粗糙度、原材料状态和轧制速率对钛/钢层状复合板界面结合强度的影响。结果表明:界面作用力和轧制力对界面的作用时间是影响钛/钢层状复合板界面结合强度的主要因素。轧制压下率、表面粗糙度和原材料状态通过影响界面作用力来影响钛/钢层状复合板的界面结合强度;轧制速率通过影响轧制力对界面的作用时间来影响钛/钢层状复合板的界面结合强度;钛/钢层状复合板的冷轧复合效果与轧制道次无关,只有单道次轧制压下率超过临界轧制压下率时,才能实现冷轧复合。 相似文献
5.
6.
7.
目的 为消除TA2薄壁圆管在辊弯成型过程中产生的边波缺陷,研究分析不同成型方法中TA2薄壁圆管焊缝处纵向应力及应变大小的变化规律。方法 运用专业型钢软件COPRA RF和有限元MSC.MARC商业软件建立符合生产标准的三维薄壁圆管模型,展开多机架连续辊弯成型过程的有限元仿真,并进行辊弯成型试验验证。结果 试验结果表明,成型方式不合理是引起TA2薄壁圆管辊弯成型边波的重要原因。随着道次间成型结束后塑性应力与纵向应力的累积,TA2薄壁圆管焊缝处出现褶皱现象,即薄壁圆管产生边波缺陷。通过有限元分析及TA2纯钛薄壁圆管生产试验验证发现,基于普通成型法加工的薄壁圆管焊缝处失稳区辊弯纵向应变波动峰值由0.6%降低到基于上山法成型的0.3%。结论 使用上山法可以消除TA2纯钛薄壁圆管在辊弯加工工艺中产生的边波缺陷,提高了产品精度并为后续装配提供了保障,研究结果为消除工业纯钛圆管边波缺陷奠定了良好的理论基础。 相似文献
8.
9.
针对TA15薄壁及蜂窝等复杂结构件设计和焊装的需求,本文采用急冷技术成功制备Ti-Zr28-Cu15-Ni15(1#),Ti-Zr21-Cu20-Ni15(2#)非晶箔带钎料.通过SEM,EDS和XRD等分析测试手段,分析了钎料及钎焊工艺对TA15钛合金钎焊接头界面组织和力学性能的影响.研究结果表明:两种钛基非晶钎料成带性能良好,与相同成分晶态钎料相比,液相线温度降低,熔化温度区间减小.钎料对母材有明显润湿作用,并且2#钎料共晶成分的提高使得其润湿性和非晶形成能力较1#钎料优异.1#钎料对接接头室温拉伸强度在970℃/30min工艺下达到最高325MPa,2#钎料在950℃/30min工艺下接头强度达到最高359MPa,并且其接头力学性能的稳定性较1#钎料要高.对比相同工艺下不同钎料焊缝组织,钎缝均为α+β层片状组织,2#钎料界面处Ti-Cu和Ti-Ni金属间化合物含量较少. 相似文献
10.
11.
研究了焊轮压力和焊接电流对无间隙原子钢压平缝焊接头抗拉强度的影响。结果发现:对于1.5mm厚的IF钢,选取7.5kN焊轮压力和18500A焊接电流时,焊接接头的性能较好;当焊接电流偏低或偏高时,适当增加焊轮压力可以提高接头的性能。 相似文献
12.
目的 基于复杂加载状态试验和先进屈服准则,实现考虑塑性演化的TA4纯钛在复杂加载状态下塑性各向异性行为的精确表征。方法 通过0°、45°、90°方向的单拉试验和复杂加载比例的十字形试件双向拉伸试验,获得TA4纯钛的基本力学性能参数和拉伸屈服轨迹,采用不同的屈服准则对试验屈服轨迹进行预测,并通过变r值的屈服准则预测其屈服轨迹的塑性演变规律。结果 在小变形范围内,Yld2000?2d屈服准则对TA4屈服轨迹的预测精度最高;塑性变形过程中,呈线性增大趋势的r值与TA4纯钛的屈服轨迹演变现象直接相关。结论 试验与理论屈服轨迹的对比表明,Yld2000?2d屈服准则可以实现TA4纯钛初始屈服行为的精确表征。TA4纯钛带材的r值随塑性变形呈线性增大趋势,考虑塑性演化的Barlat89屈服准则预测的TA4屈服轨迹外凸性更显著。在TA4纯钛带材冲压成形过程的有限元分析、模具设计和工艺优化中,仅考虑初始屈服轨迹时,可采用Yld2000?2d屈服准则;当各向异性特征存在较强的塑性演化相关性时,可采用形式相对简单的Barlat89屈服准则。 相似文献
13.
Hermann-J. Kopineck Rudi Löffel Heiner-B. Otten 《Journal of Nondestructive Evaluation》1993,12(1):13-19
In the manufacture of sheet metal, it is ofgreat importance that the quality should be homogeneous over the entire length of a strip. This can only be monitored using a continuous, on-line measuring method. A new X-ray transmission measuring technique has been developed for the nondestructive determination of texture-dependent technological data of rolled strip. It can be applied on-line for both hot and cold rolled metal strip, especially steel strip. The paper describes the measuring principle and gives information on the application for measuring ther
m
-values and the earing-values of cold rolled steel strip. With the data from these values, the user can control the deep drawing characteristics of his strips. The extension of the basic measuring principle to a condition-free determination system will be demonstrated with its application for measuring texture dependent technological data of hot and cold rolled steel strip. Long term experience at Hoesch Stahl AG, typical results measured over the total strip length, integration in quality assurance systems, questions of maintenance, etc. will be discussed. 相似文献
14.
Ridge-buckle defects in cold rolled thin strip originate from the formation of ridges in hot rolled coil and corresponding ridges left in the strip following annealing, cold rolling and tempering. A numerical solution was developed to calculate three-dimensional stress distribution in a wound coil built up wrap-by-wrap and subsequent flatness change in the uncoiled product. The model takes into account both nonlinear compressible characteristic of interwrap layer and uneven strip profile, especially ridges, on the stress evolution during the coiling process. The sensitivity of ridge-buckle defects in cold rolled thin strip to ridges in hot rolled coil profile has been investigated in details. The results show that the ridge-buckle defects in tin plate are much dependent on the height, width and location of ridges in hot coil profile. The permissible tolerance of ridges in hot rolled coil, below which does not produce the ridge-buckle defects in subsequent cold rolling of thin strip, are recommended for different steel grades. 相似文献
15.
16.
17.
焊缝对拼焊板成形性能的影响 总被引:5,自引:0,他引:5
邱晓刚 《理化检验(物理分册)》2005,41(4):166-170
采用激光焊接技术对冷轧薄钢板进行拼焊,通过对拼焊板进行拉伸试验和模拟成形性能试验,研究分析了焊缝对拉伸性能参数和成形性能参数的影响,比较了拼焊板与母材性能的差异,分析了强度比和厚度比对塑性变形的影响及应变分布。 相似文献
18.
19.
《Materials Science & Technology》2013,29(6):819-825
AbstractAluminium foams were produced by applying powder metallurgy technology. The process began by making aluminium powder and mixing it with alloy powder (Al5Si4Cu4Mg) and foaming agent (TiH2). The mix was compacted to the form of a billet by cold pressing and then it was hot extruded to a dense foamable strip, which was cold rolled to give 40% thickness reduction. The resulting precursor composites of both the extruded strip and the extruded plus rolled strip were then freely foamed without a mould at a constant temperature of 700°C for different foaming times. The effects of aluminium powder content and cold rolling on the foaming characteristics of the foamable composite strip were studied. It is noted that aluminium powder fibre in the extruded composite strip acts as a barrier to pore initiation and evolution due to the higher melting point of pure aluminium fibre than that of the alloy matrix. Cold rolling promotes foaming of the composite strip due to the TiH2 cracking and debonding between TiH2 particles and metal matrix. The morphological and microstructural evolution of composite foams was also investigated. The foaming mechanism can be described by the following sequence: cracklike pore nucleation between elongated powder fibres; ellipsoidal, spherical, and polygonal pore growth; and the collapse of pores as a result of coalescence. 相似文献