经热氢处理后TC21合金的显微组织与力学性能（英文）

Microstructures and mechanical properties of TC21 alloy after thermohydrogen processing

文章对比研究了置氢和除氢TC21合金的组织和力学性能。结果表明,随着TC21合金中氢含量的增加,α相的含量减少,而β相含量增加,氢化合金的抗压强度下降,但极限压缩率增加。相比未氢化的TC21合金,含有适当氢含量(0.6wt%~0.9wt%)的合金在塑性变形过程中表现出更高的塑性(最大增加了30.3%)以及更低的流动应力(下降了150MPa^200MPa),这将有利于改善TC21合金的冷塑性成形。除氢后,TC21合金组织细化明显,讨论了初生α相和β转变组织的细化机理。除氢后,TC21合金的抗压强度和显微硬度增加,而极限压缩率下降。当0.6wt%~0.8wt%的氢被临时引进并排出后,合金的抗压强度增加了4.5%(约65MPa)。临时引入并排出0.8wt%的氢后,显微硬度从331HV提高至373HV。

Microstructures and mechanical properties of the hydrogenated and dehydrogenated TC21 alloys were contrastively studied in the present work.Results show that the amount of primaryαphase decreases,while the amount ofβphase increases with the increase of hydrogen content in TC21 alloy.The compressive strength of the hydrogenated TC21 alloy decreases,while the ultimate compression increases with the increase of hydrogen content.Comparing with the unhydrogenated TC21 alloy,the hydrogenated alloys with suitable hydrogen contents（0.6wt%-0.9wt%）exhibit higher plasticity（max improve by 30.3%）and lower flow stress（decrease about 150MPa-200MPa）,which contributes to improving the cold plastic forming of TC21 alloy.After dehydrogenation,the microstructures of TC21 alloy are refined obviously,and the different refinement mechanisms of primaryαphase and transformedβstructure are discussed.The compressive strength and microhardness of the dehydrogenated alloy increase,while the ultimate compression decreases.The compressive strength of the alloy increases by 4.5%（about 65MPa）when 0.6wt%-0.8wt% H is temporarily introduced and then eliminated.Microhardness is enhanced from 331 HV to 373 HV when 0.8wt% H is temporarily introduced and then eliminated.