共查询到20条相似文献,搜索用时 78 毫秒
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开发出新型含0.5%Nb,并以W,Mo复合固溶强化的28Ni-14Cr-1.0Wo-2.1Ti-Nb-Al铁基高温合金GH2871。该合金的综合机械性能优于同类25Ni-15Cr铁基高温合金。 相似文献
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新型热作模具钢(JM)的研究与应用 总被引:1,自引:1,他引:0
5Cr4W4MoVNb钢(JM)是一种新型加钒、铌的Cr-W-Mo热作模具钢。应用结果表明,该钢具有良好的锻造性能和机械加工性能,用该钢制作的精锻齿模和扳手模的使用寿命比3Cr2W8V钢提高1倍以上。 相似文献
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耐蚀合金中钒的直接光度测定梁培德(机械工业部重庆仪表材料研究所,重庆,630700)耐蚀合金多为含钨、钼、铬、钴的镍基或半铁镍基合金。如3YC24(NiMo17Cr16W4),NiMo28,0Cr15Ni26、哈氏B-2及C-276等均含有少量钒。测... 相似文献
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用金相、透射电子显微镜、电子探针与扫描电镜分析研究得出超低碳Cr26-Ni28-Mo5-Cu3-Nb0.35不锈钢铸态组织中含有σ相,经850 ̄1120℃热处理均可形成σ相,包括(Fe-Cr)σ相,(Fe-Mo)σ相和(Cr-Ni-Si)σ相,850℃左右有M6C型碳化物和NbC析出。该钢经1150℃2h水冷固溶处理后,具有优良的耐腐蚀性能。 相似文献
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新型热精锻模具钢3Cr4Mo2NiVNb的研制 总被引:1,自引:0,他引:1
新开发的新型热精锻模具钢3Cr4Mo2NiVNb热强性明显高于H13,在应用过程中,模具寿命较3Cr2W8V钢高0.5 ̄2倍。 相似文献
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主要研究内容包括如下几个方面: 粘结相 Ni- Co( Ni ∶ Co = 1 ∶1 , 质量比, 下同) 与不同 N/ C 比的硬质相 Ti( C, N)( Ti N/( Ti C+ Ti N) = 0 .1 ,0 .3 ,0 .5 ,0 .7 ,0 .9) 之间的润湿规律;粘结相 Ni- Co - Mo , Ni - Co - Ta , Ni- Co - Mo - C 与硬质相 Ti( C, N) 之间的润湿情况;以及在 Ti( C, N) 硬质相中添加 Ta C, Nb C 等对润湿性的影响。研究表明,当硬质相中 Ti N/ ( Ti C+ Ti N) < 0 .5 时宜采用 Ni - Co 作粘结相, 而当 Ti N/ ( Ti C+ Ti N) ≥0 .5时,则应选择 Ni- Co - Mo - C 作粘结相更适合。 相似文献
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由于GH4065A合金的强化相γ′相的体积分数为43.0%,显微组织演化规律不同于传统的变形高温合金与粉末高温合金。系统分析了GH4065A合金的锻态组织特点与演化机制,发现其显微组织是一种不完全的动态再结晶(DRX)组织,动态再结晶晶粒被大尺寸γ′相限制长大,同时这些γ′相因晶界短路扩散而粗化,而未动态再结晶(unDRX)晶粒内弥散分布的小尺寸γ′相阻碍位错运动,进而形成大量由位错胞壁构成的亚结构。基于合金的锻态组织特点,可以通过固溶处理,利用动态回复(DRV)机制基本消除残留的未动态再结晶组织。根据GH4065A合金γ′相的固溶温度,可将热处理制度分为亚固溶处理与过固溶处理2种,亚固溶处理后的晶粒度为8.0级,过固溶处理的晶粒度为4.0级。经亚固溶处理后,GH4065A合金涡轮盘锻件的力学性能达到了第2代粉末涡轮盘的水平。 相似文献
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E. Hari Krishna Kartik Prasad Vakil Singh Vikas Kumar 《Transactions of the Indian Institute of Metals》2013,66(1):1-4
In the present investigation, the fatigue crack growth behaviour of modified IN 718 superalloy (Ni-0.02 %, C-19.04 %, Cr-19.31 %, Fe-3.04 %, Mo-4.73 %, Nb-1.01 %, Al-1.16 %, Ti-0.0033 %, B, all in wt%) has been compared with conventional IN 718 superalloy (Ni-0.02 %, C-19.0 %, Cr-19.35 %, Fe-3.0 %, Mo-5.10 %, Nb-0.50 %, Al-1.00 %, Ti-0.0033 %, B, all in wt%) at 650 °C. Modified IN 718 superalloy exhibits marginally lower crack growth rate as compared to conventional alloy and was attributed to roughness induced crack closure. 相似文献
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提高GH696冷轧薄板力学性能研究 总被引:1,自引:0,他引:1
为了满足标准HB5465-90)《航空用GH696合金冷轧薄板标准》中对室温力学性能的较高要求。从冶炼中强化元素Al+Ti的含量控制、时效热处理制度、冷轧变形量等方面对该合金力学性能的影响进行了试验探讨,指出Al+Ti含量越高,GH696冷轧薄板的室温强度越高;在固溶温度不变的情况下,在实际生产中,对时效热处理制度做一定调整,成品的力学性能方可满足标准要求。 相似文献
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The shrouded plasma spray process was used to deposit NiCrAlY, Ni-20Cr, Ni3Al, and Stellite-6 metallic coatings on a Ni-based superalloy (62Ni-23Cr-1.48Al-0.80Mn-0.37Si-0.10Cu-0.025C-bal Fe). NiCrAlY
was used as a bond coat in all cases. Hot corrosion studies were conducted on uncoated as well as plasma-spray-coated superalloy
specimens after exposure to molten salt at 900 °C under cyclic conditions. The thermogravimetric technique was used to establish
the kinetics of corrosion. X-ray diffraction (XRD), scanning electron microscopy/energy-dispersive X-ray analysis (SEM/EDAX)
and electron-probe microanalysis techniques were used to analyze the corrosion products. The uncoated superalloy suffered
accelerated corrosion in the form of intense spalling of the scale. The NiCrAlY coated specimen showed a minimum weight gain,
whereas the Stellite-6 indicated a maximum weight gain among the coatings studied. All the coatings were found to be successful
in developing resistance against hot corrosion, which may be attributed to the formation of oxides, and spinels of nickel,
aluminum, chromium, or cobalt. 相似文献
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Abstract:It had been studied that the effect of deformation temperature and strain-rate and strain and original grain size on stress-strain law by with thermal simulation experiment. It was analyzed that the effect of factors on crystal grain size of dynamic recrystalization (DRC). It was established that the kinematics model of super-alloy GH4169, which was relationship between the grain size of dynamic recrystallization(DRC) and function Z and technology parameters. It was established that the dynamics model of super-alloy GH4169, which was relationship between the quantity of dynamic recrystalization and function Z and technology parameters. The results presented that the grain size of dynamic recrystalization increased with increasing of temperature, and increased with the reducing of strain-rate. And it having no relationship with original grain size. The quantity of dynamic recrystalization reduced with increasing of original grain size. 相似文献
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利用卧式挤压机对GH625合金进行了管材热挤压试验,研究了挤压温度和挤压比对GH625合金管材挤压过程中的力能参数及挤压后管材不同部位的显微组织的影响.结果表明,随着挤压温度的降低和挤压比的升高,最大挤压力逐渐升高.管坯在固定挤压速度40 mm·s-1,预热温度为1150~1200℃和挤压比为3.46~4.10的条件下,可成功挤压出3种规格的GH625合金管材;挤压后的管材由于在挤压过程中发生了动态再结晶组织明显细化,管坯横向组织为等轴的动态再结晶晶粒和原始晶粒组成,纵向组织则由等轴的动态再结晶晶粒及被拉长的原始晶粒组成,呈条带状组织;挤压后管材的外壁、中心、内壁与管材的头部、中部与尾部在热挤压变形过程中,由于变形不均匀发生了不同程度的再结晶,因而存在不同程度的混晶组织.为消除混晶组织,结合设备能力与GH625合金的变形特征,可通过提高坯料挤压的变形温度和挤压比来控制变形的均匀性,并通过切头,去尾和对管材内壁进行少量机加工的方法,可获得具有完全动态再结晶组织的挤压管材. 相似文献