共查询到20条相似文献,搜索用时 109 毫秒
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研究了不同热处理工艺对9Ni钢板低温韧性的影响。结果显示:采用QLT热处理工艺时,首次淬火温度对最终性能的影响较小,回火温度对钢板的强韧性影响最大。两相区淬火显著提高钢板低温韧性主要有3个原因:在两相区温度内钢板未完全奥氏体化,组织中含有软相铁素体;两次淬火可以细化晶粒;回转奥氏体提高韧性。9Ni钢板的低温冲击韧性得以提高是多个因素共同作用的结果。 相似文献
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A series of Mg2-xNdxNi(x=0.05,0.1,0.2,0.3)alloys and Mg1.95RE0.05Ni(RE= La,Ce,Pr,Nd,Y)ternary alloys were prepared by ball milling of mixted powder of Mg,Ni,RE and sintering under the protection of argon.XRD analysis shows that Mg2-xNdxNi(x=0.05,0.1)and Mg1.95RE0.05Ni consist of single phase with the same crystal structure as Mg2Ni.While three-phase alloys including Mg2Ni,NdNi and NdMgNi4 were formed in Mg1.8Nd0.2Ni and Mg1.7Nd0.3Ni alloys respectively.The lattice constants of Mg2Ni in those ternary alloys were calculated.The decomposition of Mg2Ni occurs in the milling process of Mg2Ni and Mg1.95RE0.05 Ni alloys respectively.For the latter,another earlier reaction occurs in milling process,which means that atoms of RE are separated from crystal structure of Mg2Ni and form relevant oxides by combination with oxygen existed in argon atmosphere. 相似文献
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介绍了AOD炉运用氮气在不锈钢中溶解与脱除理论所开发的氮合金化工艺。在40tAOD炉上冶炼0Cr19Ni9N,0Cr19Ni9NbN,1Cr17Mn6Ni5N,00Cr18Ni5Mo3Si2(N),00Cr22Ni5Mo3N等舍氮不锈钢钢种。不需在线分析钢中氮含量,较为准确地预测与控制钢中氮溶解度值及舍氮不锈钢成品的氮含量。 相似文献
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A series of Mg2-xNdxNi (x =0.05, 0.1, 0.2, 0.3) alloys and Mg1.95RE0.05Ni (RE= La, Ce, Pr, Nd, Y)ternary alloys were prepared by ball milling of mixted powder of Mg, Ni, RE and sintering under the protection of argon. XRD analysis shows that Mg2-xNdxNi (x = 0.05, 0.1 ) and Mg1.95RE0.05Ni consist of single phase with the same crystal structure as Mg2Ni. While three-phase alloys including Mg2Ni, NdNi and NdMgNi4 were formed in Mg1.8Nd0.2Ni and Mg1.7Nd0.3Ni alloys respectively. The lattice constants of Mg2Ni in those ternary alloys were calculated. The decomposition of Mg2Ni occurs in the milling process of Mg2Ni and Mg1.95RE0.05Ni alloys respectively. For the latter, another earlier reaction occurs in milling process, which means that atoms of RE are separated from crystal structure of Mg2Ni and form relevant oxides by combination with oxygen existed in argon atmosphere. 相似文献
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Pure Ni and Ni alloy tapes with sharp cube texture and low-angle grain boundaries prepared by thermomechanical process were extensively used as substrates for coated conductor. The thermomechanical process usually includes hot forging and cold rolling. In this study, a hot-rolling process between hot forging and cold rolling was induced. The influence of hot rolling on the cube texture of pure Ni was discussed. Sharp cube texture on pure Ni was obtained by suitable hot rolling, cold rolling, and recrystallization treatment. This deformation texture of tape was studied using orientation distribution function (ODF). Orientation mapping, content of the cube texture, and grain boundary distribution were performed using an EBSD system mounted on LEO-1450 SEM. The results show that the substrates that are hot rolled have a sharp cube texture and low-angle grain boundaries. 相似文献
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结合生产实际情况,对00Cr18NiSMo3Si2双相钢无缝管的冷、热加工工艺流程、工艺制度及性能控制方面进行深入讨论,总结出生产00Cr18NiSMo3Si2双相钢无缝管的合理工艺制度。 相似文献
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BaTiO3陶瓷表面金属化的研究 总被引:1,自引:0,他引:1
在BaTiO3陶瓷上化学镀Ni-B合金,使其表面金属化,研究了镀液组成和工艺对沉积速度的影响。选择合适的工艺可以在陶瓷表面得到性能良好的Ni-B镀层,其镀层的结构由镍和Ni2B相组合组成,镀层与陶瓷的结合强度为5.08MP。Ni-B镀层具有良好的可焊性和导电性,其电极损耗于银电极损耗,可作为代银接触镀层。 相似文献
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对镍铁矿原料及不同温度还原焙砂进行矿物学研究,探究镍铁矿选择性还原焙烧发生的相变.研究结果表明:镍铁矿主要金属矿物为褐铁矿,其次为赤铁矿;Ni在不含锰的铁矿物中分布较均匀,而在含Mn的铁矿物中分布相对集中,并与Mn伴生.镍铁矿在还原焙烧过程中Fe、Ni和Co随温度升高逐渐发生还原、相转化和迁移富集的过程.选择性还原焙烧必须严格控制焙烧温度,要达到Ni、Co和Fe的选择性还原并形成Ni高、Fe低的合金相和磁铁矿,焙烧温度采用750℃较合适,在该温度下形成的合金相组成为55.55% Ni、9.86% Co及33.99% Fe,Ni的金属转化率为88.49%,铁氧化物主要为磁铁矿. 相似文献
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利用等离子熔覆设备堆焊制备了三种不同成分的镍基合金层(Ni46、Ni67、Ni60/35WC),制样后在旋转圆盘空蚀试验机上对制备的合金层进行了空蚀磨损实验.采用SEM、XRD、显微硬度、失重分析法对空蚀前后的合金层进行了对比分析.结果表明:所有堆焊层的失重均大于对比的304不锈钢;SEM形貌观察堆焊层组织中存在缺陷或孔隙,空蚀后组织中的缺陷呈裂纹状发展,因此空蚀伴随着强烈的疲劳损失过程;XRD分析表明空蚀过程诱发了Ni60/35WC表面的相变;另外,空蚀还引起了材料Ni67和Ni60/35WC加工硬化,而Ni46出现了加工软化. 相似文献