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等离子喷涂NiCrBSi合金涂层的高温性能 总被引:1,自引:0,他引:1
根据高温涂层要求,采用等离子喷涂工艺制备NiCrBSi合金涂层试样,对涂层成分、组织、硬度、粘结强度、冷热疲劳性能、抗热震性能及常温和高温摩擦磨损性能进行了检测,对其结果进行了分析讨论.结果表明:等离子喷涂NiCrBSi合金涂层具有良好的粘结强度和抗高温氧化、耐高温磨损性能. 相似文献
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制备了耐高温低膨胀聚甲氧基有机硅(PMOS)/莫来石杂化材料.FT-IR与XRD测试表明材料在热处理过程中PMOS基体逐渐降解,而莫来石晶体则随温度的升高而稍有生长;TG测试表明材料在800℃高温处理后仍有93.4%的质量残留;SEM显示莫来石均匀分散在PMOS基体中;材料的冲击强度随热处理温度的升高而先减小后增大,800℃热处理后材料的冲击强度为924 J/m2;材料的膨胀系数很低,且随莫来石含量的增加而减小;聚甲氧基有机硅/莫来石杂化材料具有良好的耐高温性能与低热膨胀性能. 相似文献
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船舶是在海洋环境中航行的大型结构物,一般要求其有很高的安全性,包括其使用的钢材要有很高的强度。为提高产品竞争力、性能和加工生产效率,钢铁生产者从设计和加工两个方面对钢材都投入了很大的力量。特别是钢铁材料作为船体结构的主要材料,在有关强度可靠性和加工性上期待着更高功能钢材的开发研制和应用。 相似文献
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日本一家冶金公司生产了一种在高温下具有很高强度的新型钼合金 ,可用作高温冶炼炉的结构材料。这种钼合金是这样制成的 :将二氧化钼与硝酸镧溶液混合 ,干燥 ,在氢气中还原 ,经过烧结和再结晶制成。合金中含镧为 0 .5%~ 1 %。耐高温强度高的钼合金@李惠萍 相似文献
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16Cr20Ni14Si2属于经典耐热钢牌号,标准中碳、锰、硅控制范围较宽,元素含量的高低对钢的力学性能和高温性能有着明显的影响。为了了解碳、锰、硅元素等对16Cr20Ni14Si2耐热钢性能的影响,通过不同碳、锰、硅含量试验钢的力学性能比较,以及Thermal-Calc析出相计算与比较,初步了解这些元素在钢中的作用及对力学性能的影响。试验数据表明,700℃以下拉伸时,碳、锰、硅元素的含量对16Cr20Ni14Si2耐热钢高温屈服强度和抗拉强度有较大影响。 相似文献
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18Cr-Al-Si铁素体耐热不锈钢作为一种结构连接件的新型材料,主要应用于超(超)临界火力发电领域。为了明确硅含量对该钢组织和性能的影响,以18Cr-Al-Si铁素体耐热不锈钢为成分基础,施以添加2组不同成分的硅含量,通过室温拉伸和高温氧化等试验方法,同时借助金相显微镜(OM)、扫描电子显微镜(SEM)和X射线衍射仪(XRD)等表征手段,对不同硅含量试验钢组织和性能进行了系统分析。结果表明,硅含量的增加会细化铁素体的晶粒尺寸并增加M23C6碳化物的数量,试验钢的抗拉强度和屈服强度升高,伸长率下降,断裂方式由韧性断裂向韧-脆混合型断裂方式转变;1.35Si试验钢氧化增重较大,因其钢中析出的M23C6碳化物较多,减少了固溶于基体及形成氧化膜的Cr含量,降低了其抗高温氧化性。 相似文献
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对铝含量为2%、4%(质量分数,下同)的310S耐热钢板材采用手工氩弧焊(TIG)的焊接方法进行焊接,利用光学显微镜对焊缝的显微组织进行分析,利用电子探针(EMPA)分析焊接母材的元素分布,并对焊接接头进行室温和高温(800℃)力学性能测试。结果表明:不同铝含量的310S耐热钢板材焊接后的组织均良好,都没有宏观裂纹及夹杂等缺陷;铝元素的加入,抑制了焊接热影响区晶粒的异常长大,细化了晶粒;高铝310S的焊接板材与母材一样具有优良的室温力学性能和高温力学性能,加铝310S耐热钢具有良好的焊接性能。 相似文献
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P. J. Grobner V. Bišs D. L. Sponseller 《Metallurgical and Materials Transactions A》1980,11(6):909-917
Nine experimental delta-ferritic steels have been examined as potential low expansion heat-resistant steels for use in fossil
fuel power generation, nuclear power generation, nuclear process heat plants and coal gasification plants. The steels contain
10 to 14 pct Cr and 2 to 6 pct Mo, with additions of columbium, titanium, vanadium, aluminum and boron. Room-temperature tensile
properties and oxidation resistance of all steels were determined. Selected steels were aged for 1000 h at 760 °C (1400 °F)
and subjected to elevated temperature tensile tests at the aging temperature. Creep-rupture properties of selected steels
were determined at 760 and 815 °C (1400 and 1500 °F). Extensive metallographic and phase identification studies were conducted.
Of the two steels tested for creep-rupture strength, the 10Cr-6Mo-0.5Cb steel, with good room-temperature ductility, has rupture
strength exceeding that of martensitic 12Cr-1Mo-V steel. The 14Cr-3Mo-0.5Cb-lTi-2Al steel exhibits an even higher rupture
strength, but has only marginal ductility at room temperature. 相似文献
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In the last decade, the European niobium consumption in automotive strip and sheet has more than tripled. The development of high strength and advanced high strength steel grades for strip and plate products focused upon constantly increasing strength levels combined with excellent fatigue properties as well as formability and weldability. Until now, the high potential of microalloyed steel has not been used to the same extent in forgings and springs. This paper reviews automotive components as transmissions, suspensions and springs highlighting new material solutions for special steels having optimized processing and in‐use properties. Special consideration is given to the metallurgical background as well as to examples for the processing and application of niobium microalloyed steel in forgings and springs from low carbon and higher carbon containing steels. Niobium metallurgy permits the reduction of carbon to meet more stringent end‐user requirements demanding high strength combined with improved toughness, fatigue strength and weldability at a competitive manufacturing cost. 相似文献
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《Baosteel Technical Research》2010,(Z1):71
From the viewpoint of energy-saving and environment protection,it is necessary to develop Ultra Super Critical(USC) fossil-fired power plants.In order to ensure the reliable operation of power plants under high steam conditions,good mechanical properties(particularly high creep strength),corrosion resistance and fabricability are generally required for the heat resistant steels used in USC boilers.Among these heat-resistant steels,S30432 austenitic heat-resistant steels are of interest due to high creep strength,excellent oxidation and corrosion resistance at temperatures up to 650 -700℃.In this paper,the strengthening mechanism of S30432 austenitic heat-resistant steel was investigated based on the precipitation behavior of S30432 during aging and creep at 650℃.Results show that the microstructure of as-supplied S30432 steel is austenite,the main precipitation consists of only Nb(C,N).After aged for 10 000 h or crept for 10 712 h,there is a slight increase in the size of fine Nb(C,N),but the transformation from Nb(C,N) to NbCrN does not occur.Aging and creep results in the precipitation ofε-Cu and M23C6.The coarsening velocity ofε-Cu particles diminishes greatly and they are still very fine in the long-term creep range.With the increase of aging and creep time M23C6 carbides tend to coarsen gradually.The size of M23C6 is larger and the coarsening is easier in contrast toε-Cu and Nb(C,N).Nb(C,N) precipitates in the as-supplied microstructure,while aging and creep result in the precipitation ofε-Cu and M23C6.High creep rupture strength of S30432 steel is attributed to the precipitation hardening ofε-Cu,Nb(C,N) and M23C6.Extremely,ε-Cu plays an important role in improving the creep rupture strength of S30432,and at least 61%of the creep rupture strength of S30432 at 650℃results from the precipitation hardening ofε-Cu particles. 相似文献