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爆炸焊接不锈钢复合板的界面呈波浪状,在复合板界面易出现空洞、空隙和微缝隙等微观缺陷。存在结合层微观缺陷的复合板按照NB/T 47013.3—2015进行超声波探伤检测,检测结果符合标准,但是有结合界面回波高、底波未有明显降低的现象。从结合界面的微观组织、波形特征和结合强度等方面进行分析发现,造成这种现象的主要原因是微缝隙和空洞的尺寸小,不能明显降低底波,但是能形成缺陷显示。适当调整爆炸焊接工艺参数,降低炸高和爆速等,可以有效解决复合板这类问题的发生。 相似文献
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Mg/Al合金爆炸焊连接及其界面接合机制 总被引:4,自引:0,他引:4
采用爆炸焊接技术制备以AZ31B镁合金为基板,以6061铝合金为覆板的AZ31B/6061合金的层状复合板。对复合板界面的宏观形貌、微观组织、界面元素扩散行为及界面接合性能进行测试、分析。结果表明:AZ31B/6061合金爆炸复合板接合界面呈波状接合;靠近接合界面处的塑性变形程度最大,以孪晶和再结晶形式为主;在AZ31B一侧靠近界面处出现与界面呈45°的绝热剪切带组织,带内为动态再结晶形成的细晶粒组织;接合界面两侧的显微硬度分布为:随着距离接合界面的增大,AZ31B和6061侧的显微硬度值递减趋势;复合板的拉-剪试验结果表明,界面接合强度达193.3 MPa;复合板界面接合机制为压力焊、扩散焊及局部熔化焊综合作用的结果。 相似文献
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爆炸焊接中厚不锈钢复合板时,板面容易随机产生小面积的界面熔化缺陷。从理论和实践两方面对这类缺陷产生的机理加以分析,提出了引起此类缺陷的机理是由于残留于界面内的绝热压缩空气引起的。通过修正爆炸焊接参数,消除了此类缺陷,提高了中厚不锈钢复合板的爆炸焊接成品率。 相似文献
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在不同压下率轧制工艺条件下,通过观察复合界面显微组织、界面特征、剪切试验和断口形貌,对比分析压下率对热轧不锈钢复合板复合界面组织及结合强度的影响。结果表明:不锈钢复合板界面结合良好,近界面碳钢侧内有宽约80μm的铁素体带,随着总轧制压下率的增加,碳钢侧铁素体组织晶粒逐渐细小、均匀化,晶界的面积也越来越大,可有效地提高不锈钢复合板的强度。但较大的压下率使碳钢侧晶体发生不同程度的晶内滑移,产生加工硬化现象,且随压下率的增加,晶内滑移更加明显,在铁素体中出现滑移带。通过系列剪切试验发现,复合板结合强度随总压下率的增加呈增加趋势,增加的趋势逐渐减缓,其断裂方式为脆性断裂+韧性断裂,最大剪切强度可达459.6MPa,远高于标准中规定的210MPa。 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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一种涡旋压缩机径向随变机构的设计 总被引:1,自引:0,他引:1
详细介绍了运用随变原理设计的一种新型径向密封机构的结构特点,工作原理及主要参数的确定方法,该机构可补偿由于涡旋体加工精度不高而造成的功率损失,适用于涡旋压缩机的批量生产。 相似文献
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V. P. Dragunov E. G. Kostsov 《Optoelectronics, Instrumentation and Data Processing》2009,45(3):234-242
Specific features of operation of one- and two-capacitor microelectromechanical converters (MEMC) of energy of mechanical microscopic vibrations into electric energy with a modulated electrode-gap magnitude and with allowance for the mutual influence of electrical and elastic forces are analyzed, and the characteristics of these two devices are compared. The main factors restricting the increase in MEMC power are demonstrated to be the effects of “collapsing” and the condition of conservation of positive rigidity of the system. Expressions for estimating the limiting MEMC parameters are derived. The possibility of electrical energy generation in the presence of “real“ sources of wide-spectrum microscopic vibrations is considered. 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献