共查询到19条相似文献,搜索用时 109 毫秒
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研究了25 kg感应炉熔炼的Co-Ni-Cr-Mo二次硬化超高强度钢(%:0.16C、11.0Ni、2.0Cr、3.0Mo、14.0Co)经460-580℃时效后的组织和力学性能。试验结果表明,该钢经860℃淬火+(-73℃)冷处理+480℃时效后,组织中存在大量弥散分布的针状M(Co,Mo)2C碳化物,钢的屈服强度Rp0.2达到最大值1 685 MPa,冲击功Akv为20 J;在550℃过时效状态下,板条边界逆转变奥氏体量明显增加,Akv增至32 J,同时Rp0.2下降至1 320 MPa。 相似文献
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新型不锈轴承钢6Cr14Mo冲击韧性与显微亚结构 总被引:1,自引:0,他引:1
在同等硬度下,新型不锈轴承钢6Cr14Mo(%:0.64C,13.6Cr,0.62Mo)的冲击韧性ak比9Cr18不锈轴承钢(%:0.94C,18.6Cr)高14—30J/cm^2。从碳化物电镜复型分析可见,6Cr14Mo钢淬、回火组织中主要为细小、弥散分布的二次碳化物,一次碳化物较少,而9Cr18钢组织中一次碳化物较多。新型不锈轴承钢6Cr14Mo的基体组织为板条马氏体,并有少量残余奥氏体,组织中的碳化物主要为M23C6以及弥散析出的Mo2C和ε-Fe2C。 相似文献
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试验1Cr12Ni3Mo2VN钢(/%:0.13C,0.16Si,0.70Mn,11.42Cr,2.78Ni,1.67Mo,0.30V,0.0360N)的冶金流程为30t EAF-LF-VD-3t ESR-锻造成Φ350mm材。研究了950~1100℃淬火和200~700℃回火对1Cr12Ni3Mo2VN钢组织与性能的影响以及500℃,500~10000h时效的拉伸性能。结果表明,淬火温度950~1100℃对1Cr12Ni3Mo2VN钢力学性能的影响不明显;该钢的回火脆性区在600℃左右,但对钢的塑性的影响较小。经1040℃淬火、540℃回火的1Cr12Ni3Mo2VN钢,在500℃时效500h后,其抗拉强度和屈服强度分别下降了7.7%和5.8%,时效10000h后,其抗拉强度和屈服强度分别下降了13.4%和14.6%,断面收缩率下降了40%,主要原因是杂质元素在晶界处偏聚以及碳化物在晶界处析出。 相似文献
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A. V. Kozlov I. A. Portnykh A. V. Tselishchev O. B. Shilo O. I. Asiptsov 《Russian Metallurgy (Metally)》2014,2014(5):412-418
Samples of 0.06C-16Cr-15Ni-2Mo-2Mn-Ti-Si-V-B and 0.07C-16Cr-19Ni-2Mo-2Mn-Ti-Si-V-P-B steels (ChS68 and EK164 steels, respectively) in the form of fuel element cladding tubes from a BN-600 reactor have been subjected to neutron irradiation in an IVV-2M research reactor to damage doses of 0.0015, 0.0050, and 0.0100 dpa at a temperature of 30°C. Based on a comparison of the results of dilatometric measurements of the irradiated samples and the samples in the initial state, the energies of vacancy migration in the steels are calculated. It is found that the energy of vacancy migration is 1.08 ± 0.02 eV in the ChS68 steel and 0.98 ± 0.02 eV in the EK164 steel. Using these values, the steady-state vacancy concentrations during irradiation of these steels in the BN-600 reactor are calculated. It is shown that the steady-state vacancy concentration in the EK164 fuel cladding portions irradiated in the lower half of the core is significantly lower than that in the ChS68 cladding. This is a cause of the higher resistance of the former steel to radiation-induced swelling as compared to that of the ChS68 steel upon irradiation in fast neutron breeders. 相似文献
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建立了14Cr-13Co-5Mo-2Ni齿轮钢(/%:0.014C,0.26Si,0.17Mn,13.79Cr,12.69Co,4.66Mo,2.00Ni,0.53Al)直径290 mm 9 t锭真空自耗熔炼过程三维数学模型,研究冷却水压、电流和熔化速率对自耗锭凝固组织分布及晶粒大小的影响。研究结果表明,当冷却水压由6000 MPa增加到8000 MPa,电流由6.2500 kA减小至6.2286kA,熔化速率由1.250 kg/s降低至1.125 kg/s后,冶炼的自耗锭内部等轴晶区域增大将近1倍,晶粒数目提高了45.17%,晶粒平均半径减小了17%,最大二次枝晶间距减小了4.88%,基本达到晶粒细化,合金元素分布均匀化的目的。 相似文献
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Rangasayee Kannan Yiyu Wang Leijun Li 《Metallurgical and Materials Transactions A》2017,48(3):948-952
A unique dilatation trend is observed for isothermal bainite transformation in Fe-0.84 pct C-1 pct Cr-1 pct Mn steel. The dilatation is found to occur in two stages with volumetric contraction dominating the first stage, followed by volumetric expansion dominating the second stage. Through electron microscopic characterization, bainitic microstructure is identified as inverse bainite with cementite (Fe3C) nucleating first from supersaturated austenite followed by the transformation of ferrite and secondary carbides (Fe3C, Fe2C, and Fe5C2) from carbon-depleted austenite. 相似文献
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试验0.05C-14Mn-19Cr-0.7N钢经1t非真空感应炉冶炼,并重熔成电渣锭。在电渣锭中心取样,通过Gleeble 3800热模拟试验机对试验钢进行800~1250℃,应变速率0.005~10s-1的高温拉伸试验,得出温度和应变速率对试验钢断面收缩率的影响,并观察了各温度拉伸后的组织。试验结果表明,随着温度从800℃升高至1250℃,试验钢抗拉强度从327 MPa下降到68 MPa,断面收缩率由22%升至55%;1200℃时,应变速率从0.01s-1增加到10s-1时,试验钢的抗拉强度从43 MPa增加至109 MPa,断面收缩率从38%提高至71%。综合实验结果,高氮奥氏体不锈钢0.05C-14Mn-19Cr-0.7N最优的变形参数为:1200~1250℃,应变速率1~10s-1。 相似文献
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《钢铁研究学报(英文版)》2016,(12):1303-1308
The Thermo-Calc software was employed to calculate the equilibrium phase of 22Cr-27Ni-2Ti-Al austenitic valve steel,and the Laves phase in this steel was investigated after solid solution and aging by means of scanning electron microscopy( SEM),transmission electron microscopy( TEM) and X-ray diffraction( XRD).Results show that the microstructure of the experimental steel consists of γ,γ',Laves and Nb C.Laves phases mainly precipitate on grain boundaries,with granular and fibrous morphologies.The size of the granular Laves phase is about 50-600 nm,and the fibrous Laves phase is composed of short strip Laves phases which are 300-600 nm in length and 50-150 nm in width.These two morphologies of Laves phase coarsen with increasing aging temperature,and this steel possesses the highest strength and hardness at aging temperature of 760 ℃. 相似文献
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The melting and solidification of a powder alloy Ni-0.5 wt % C-15 wt % Cr-3.2 wt % Si-2 wt % B is studied. The microstructure and chemical composition of the phases present in the compact alloy prepared by melting of the powder are investigated. The sequence of phase formation during solidification of the alloy is suggested. 相似文献