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钛合金TB5板坯脆断原因分析黄德明1,杨雄飞1,韦青峰1,王怀柳2,周茂华2,陈鑫2,赵同新-1,徐聪2(1.攀钢集团研究院有限公司,四川成都 6117312.攀钢集团江油长城特殊钢有限公司,四川江油 621700)摘 要:通过对发生脆性断裂的钛合金TB5试制板坯的化学成分,断口形貌,微观组织进行分析,结果表明板坯化学成分均匀,满足国标要求;断口呈解理及准解理断裂特征,断口有析出相存在,但无夹杂物出现;板坯组织为粗大的等轴晶,晶内有长针片状的析出相,分布均匀且规则.分析显示:板坯发生脆断行为与化学成分无关,导致......
equiaxed grains play an important role on CET. The effects of the applied thermal gradient and pulling velocity, the equiaxed seed spacing and nucleation undercooling on the CET are investigated...NUMERICAL SIMULATION OF COLUMNAR TO EQUIAXED TRANSITION FOR DIRECTIONALLY SOLIDIFIED Ti-44Al ALLOY H.Z. Fu1,G.F. Mi1,J.J. Guo2,K.F. Wang1,C.Y. Li1 (1.School of Materials Science and Engineering......
; 3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China) Abstract: The equiaxed grains ratio of 430 ferritic stainless steel is only about 30% under slow cooling conditions, and the equiaxed grains diameter is between 0.5-2.0 mm. The columnar grain length is between 1.5-2.5 mm, and the width is between 0.5-1.5 mm. When the heat......
recrystallized grains. The migration of high angle grain boundaries along normal direction leads a gradual transformation from the elongated grains to the nearly equiaxed, which is driven by the tension of the grain boundaries.
Key words: AA2195 Al-Li alloy; microstructure evolution; elongated grains; equiaxed grains; recrystallization; second phase particles
Fine equiaxed β grains and superior tensile property in Ti–6Al–4V alloy deposited by coaxial electron beam wire feeding additive manufacturingJiahua Zhang1,Yi Yang1,Sheng Cao2,Zhiqiang Cao1,Songquan... with fine equiaxed β grains(EGβ), discontinuous grain boundary α phase and short intragranular α lamellae. A large region of fine EGβ arises from a special combination of the temperature gradient......Fine equiaxed β grains and superior tensile property in Ti–6Al–4V alloy deposited by coaxial electron beam wire feeding additive manufacturing
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来源: 《Acta Metallurgica Sinica2020年第10期》——Jiahua Zhang Yi Yang Sheng Cao Zhiqiang Cao Songquan Wu Enquan Liang Xi Zhang Wei Chen Fan Wu Aijun Huang
cavity can be remarkably decreased, and the equiaxed grains zone are enlarged by means of application of appropriate low-frequency electromagnetic-field parameters. The industrial trials verify... that of molten carbon steel in the same magnetic flux density. Key words: horizontal continuous casting; austenitic stainless steel; electromagnetic stirring; equiaxed grains; central porosity......
by experiments, and the electromagnetic fields and flow fields during the stirring process were analyzed by numerical simulation. The results show that the billet of almost 100% equiaxed grains can be obtained.... It is presented that the pulsating electromagnetic force perpendicular to the movement of the molten steel, is an important factor of increasing the equiaxed zone ratio in the solidification structure, which......
, changing from equiaxed grains to columnar grains in the center of ingots. It is indicated that the increase of phosphorous reduced the nucleation of grains and promoted dendrite growth during...Influence of phosphorous on nucleation and growth of grains during solidification in a NiCrFe alloyXintong Lian1,2,Wenru Sun1,Litao Chang1,Fang Liu1,Xin Xin11. Institute of Metal Research, Chinese......
Current understanding of the origin of equiaxed grains in pure metals during ultrasonic solidification and a comparison of grain formation processes with low frequency vibration, pulsed magnetic... and Mining Engineering, University of Queensland摘 要:The formation of fine, non-dendritic equiaxed grains throughout a casting without the addition of refiners(i.e.......
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