A Study of Modes of Hardening Heat Treatment of Titanium Alloy VT23

Metal Science and Heat Treatment - The microstructure and mechanical properties of alloy VT23 are studied after different variants of quenching and aging. The best combination of mechanical...     

用MK—150／250冷轧机轧制钛棒

对ＭＫ－１５０／２５０冷轧机的四辊组合孔型制法进行了分析和实验研究,设计了用该轧机轧制钛棒的孔型及辅助导板,通过试验得到理想的钛方、矩形棒和圆棒,并对该轧机与肚辊轧机现任中轧制方法的轧件力学性能做了比较和理论分析,说明四辊轧制受力状态对轧件的抗拉强度和延经的影响。     

Effect of Initial Microstructure on the Mechanical Behavior and Evolution of Structure due to High-Temperature Stretching of VT9 Titanium Alloy

The effect of the initial structure of double-phase titanium alloy VT9 on the mechanical behavior and changes in the structure due to high-temperature uniaxial stretching is studied. Values of structural parameters after deformation are presented for six initial structural states of the alloy. The characteristics of uniform and lumped strain are computed. The effect of high-temperature annealing preceding the deformation on the ductility characteristics is described.     

Ti40阻燃钛合金的高温氧化行为

研究了高稳定β型阻燃钛合金Ti40合金在900℃-1050℃温区内氧化时的氧化行为。结果表明：随着温度的升高及时间的延长，试样表面氧化皮由较为平整变化为表面氧化皮严重脱落且基体表面呈现为淡绿色。对该物质进行能谱分析后显示淡绿色物质为TiO2和Cr2O3的混合物。900℃～1000℃的氧化动力学曲线显示，随温度升高氧化增重急剧增加，在温度1000℃～1050℃范围内，试样氧化增重虽仍随时间的增加而增加，但总量有所下降。     

Topographic Analysis of Titanium Alloy VT6 After Superplastic Yielding

Special features of surface topography of specimens of alloy VT6 after superplastic deformation at 850°C under the conditions of reduced surface evaporation of titanium are analyzed. Marker scratches on grain boundaries are shown to displace as a result of grain boundary sliding, and the distance between markers inside grains is shown to change, which indicates intragrain dislocation sliding. Results of an evaluation of the contribution of these mechanisms into the total strain are discussed.     

高温形变热处理对Ti-1300合金组织及硬度的影响

采用光学显微镜、扫描电子显微镜、Gleeble-3800热模拟试验机以及IMVS-1000JMT2数显维氏显微硬度仪研究了等温变形条件下形变热处理对Ti-1300合金组织及硬度性能的影响。结果表明:高温形变热处理可以明显的细化Ti-1300合金的显微组织,并在一定程度上提高合金的力学性能。热轧态合金的组织中粗大块状和长条状α相经高温压缩变形后具有明显的等轴均匀化趋势,然后分别经过淬火时效和固溶时效处理后合金的组织主要由板条状初生α相,针状次生α相以及β相组成,初生α相和次生α相主要分布于晶界和β基体上。与淬火时效态相比,固溶时效态合金的硬度随初生α相板条厚度和含量的增加而降低,最后对影响的机理进行探讨和分析。     

Post Weld Annealing of Welded Joints of Refractory Titanium Alloys VT41 AND VT8-1

Metal Science and Heat Treatment - Mechanical properties and structure of butt welded pseudo-α-(VT41) and (α + β)-(VT8-1) refractory titanium alloys are studied as applied to...     

Effect of High-Temperature Thermomechanical Treatment on the Brittle Fracture of Low-Carbon Steel

The effect of high-temperature thermomechanical treatment (HTMT) on the brittleness connected with deformation-induced aging and on the reversible temper brittleness of a low-carbon tube steel with a ferrite–bainite structure has been studied. When conducting an HTMT of a low-alloy steel, changes should be taken into account in the amount of ferrite in its structure and relationships between the volume fractions of the lath and the acicular bainite. It has been established that steel subjected to HTMT undergoes transcrystalline embrittlement upon deformation aging. At the same time, HTMT, which suppresses intercrystalline fracture, leads to a weakening of the development of reversible temper brittleness.     

Investigation of the Deformation Behavior of Annealed Titanium Alloy VT16 Under Compression

Metal Science and Heat Treatment - The effect of crystallographic texture and deformation rate on the deformation behavior of titanium alloy VT16 after annealing at 700 – 880°C is...     

Cracking of Welded Joints of Cast and Deformed Titanium Alloy VT5

The macro- and microstructure and microhardness of welded joints of titanium alloy VT5 are investigated. Fracture surfaces are studied and fractional analysis of hydrogen in cast metals is performed. Suggestions are put forward as to the causes and mechanisms of formation of cracks in a weld joint of a forging and a casting from alloy VT5. Places of crack initiation and subcritical growth are determined.     

The fracture of titanium alloy VT3-1

Metal Science and Heat Treatment -     

改进型BT25y钛合金热处理工艺对棒材组织和性能的影响

对改进型BT25y钛合金棒材固溶、时效热处理与力学性能的关系进行了研究。结果表明,改进型BT25y钛合金强化热处理的固溶温度为900～945℃,时效温度为530～550℃,在该工艺范围内处理,可获得均匀α＋β等轴组织,且组织性能匹配较好,各项拉伸性能指标均达到或超过工程应用的技术要求。     

航空发动机用BT3—1（TC6）钛合金棒材的试制

介绍了BT3－1钛合金棒材的生产工艺及其分析检验结果。     

热处理对Ti-6Al-4V棒材固溶时效性能的影响

概述了对飞机转动件叶片用Ti-6Al-4V(TC4)钛合金棒材通过采用不同固溶时效热处理制度的实验,以研究TC4用钛合金棒材不同热处理制度与组织、固溶时效性能之间的关系,通过对比试验得出工业化生产满足宇航结构件和转动部件用TC4棒材制定合理的固溶时效热处理制度。