共查询到19条相似文献,搜索用时 93 毫秒
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为了能够更好的指导复合材料焊接工艺的制定,采用自熔等离子弧焊、埋弧焊和钨极气体保护焊3种焊接方法进行组合焊接。焊后通过金相显微镜、扫描电子显微镜、X射线能谱仪等分析方法,分析了轧制复合板及其接头的微观组织、界面元素分布、显微硬度及拉伸性能。结果表明,基材和覆材(复合材料的耐腐蚀层)界面元素扩散层厚度约10μm,由于增碳层和脱碳层的存在,显微硬度值随之升高和降低,抗拉强度达665 MPa,断口形貌呈韧脆混合断裂特征。焊接后,基材与过渡层焊缝界面扩散层厚度约5μm,基材与覆层焊缝界面扩散层厚度约3μm;第一道覆层焊缝由于受到多道焊缝焊接热的作用,铁素体体积分数含量达65%,平均显微硬度约380 HV0.2;接头抗拉强度与复合板相比降低约11%,断口韧窝大小、深度明显减小,断裂在焊缝处。 相似文献
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不锈钢板激光焊接接头组织与性能 总被引:1,自引:0,他引:1
时不锈钢板进行激光焊与氩弧焊时比试验。结果表明:激光焊焊缝中晶粒尺寸小于氩弧焊焊缝的晶粒尺寸。而激光焊接接头的显微硬度高于氩弧焊的,激光焊件断口边缘有解理面存在,焊缝中心呈韧窝状。对于薄板件焊接,激光焊接质量较好。 相似文献
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以汽车油箱9Ni钢焊接接头为对象,研究不同热输入条件下焊接接头的微观组织和性能。结果表明,热输入为16 k J/cm时,9Ni钢焊接接头的枝晶偏析较弱,热输入为12 k J/cm时,接头的整体硬度值最大,冲击性能达标。 相似文献
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采用搅拌摩擦焊对接工艺焊接厚度为2 mm的TA2-Q235B钛钢复合板。采用光学显微镜和扫描电子显微镜观察焊接接头显微组织及断口形貌,并采用拉伸试验机和显微硬度计测试焊接接头力学性能及不同区域的显微硬度。结果表明,钛钢复合板焊接接头从上到下分为上部钢焊接区,中部钛钢混合区及下部钛焊接区3个区域,其中钛钢混合区呈交替层叠状结构。当轴肩旋转速度为300 r/min,焊接速度为40 mm/min时,焊接接头的抗拉强度为386 MPa,达到母材强度的80%以上,焊接区域的硬度平均值为243.5 HV,焊接接头断裂源于结合较弱的前进侧热机影响区域。 相似文献
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采取外层先离心浇注10号钢,再浇注内层1Cr18Ni9Ti得到离心复合空心管坯,管坯内外表面加工后进行热挤压和冷轧,试制出了47mm×4.5mm的碳钢/不锈钢复合钢管,对不锈钢离心复合管坯生产复合钢管工艺路线进行研究,并对复合管金相组织、性能及结合层质量等方面进行分析。结果表明,复合管内外层冶金结合良好,晶粒明显细化,终轧后晶粒由铸态时3.0~3.5级变为7.0~8.0级,复合管压扁、弯曲及热处理后晶界腐蚀检验合格。 相似文献
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研究了用累积复合轧制技术制备的8层不锈钢复合材料,经(200~900)℃×(0.5~2)h热处理后,微观组织以及力学性能的变化。结果表明:在保温时间不变的条件下,随热处理温度升高,微观组织逐步经历了回复→再结晶→晶粒长大的过程,抗拉强度和硬度下降,塑性提高,600℃以上温度变化较为显著;在温度不变的条件下,随保温时间的延长,组织和力学性能变化不是很明显。试样弯曲90°试验未见明显分层和撕裂迹象,且拉伸试样均为韧性断裂。采用600℃×1 h的热处理制度,材料的综合力学性能较佳。 相似文献
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A turtle carapace bio-inspired Ti matrix hybrid composite was successfully fabricated in this work.This composite incorporates two parts: the Ti–Al intermetallic multilayered composite and continuous Si C fibers-reinforced Ti matrix composite.In the Ti–Al intermetallic multilayered composite part,a series of Ti–Al intermetallics compounds,including Ti_3Al,Ti Al,Ti Al_2 and Ti Al_3,were formed between the Ti layers.In the continuous Si C fibers-reinforced Ti matrix composite part,Si C fibers and Ti matrix were found to be bonded well through weak interface reaction.Flexural strength of this material reached 1.21 ± 0.16 GPa,measured by three-point bending test.The deformation features suggest that the hierarchical structure combining ductile Ti layers/matrix with brittle high-strength Ti–Al intermetallics layers/Si C fibers can effectively enhance the mechanical properties of the bio-inspired hybrid composite. 相似文献
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Doc. Ing. L. Ptáček 《International Journal of Cast Metals Research》2013,26(4):228-230
Editorial Note and SynopsisThis paper does not fall within the usual strict definition of cast metals science and technology, since it is concerned with a wholly solid-state process. It has, however, been accepted for publication in Cast Metals, since its treatment of the influence of fibre reinforcement on mechanical properties of a light alloy is considered to be pertinent to the growing understanding of the behaviour of composites, whether wrought or cast, as a major group of essentially new materials.In this paper, the author examines the properties of a composite material with a matrix of hardenable AlZn4Mg1 alloy, reinforced by maraging steel fibres. For the purpose of the investigation the material was produced from layers of steel reinforcement fibre, interleaved with aluminium foil, which were subsequently hot pressed under vacuum. It was found that the presence of reinforcement fibres increased the strength by approximately twice the initial value. Nevertheless, the theoretical strength and Young's Modulus were about 15% higher than the values obtained. This was thought to be due to the considerable heterogeneity of the matrix. The reinforcement steel exhibited plastic behaviour, the matrix condition depending on the type of ageing. The diffusion layer on the fibre surface exhibited brittle fracture. 相似文献
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