研究在加热和冷却过程中的氢致Ti?6Al?4V合金组织转变和相转变.试样从室温加热到1273 K,随后又冷却至室温.氢含量范围为0~0.8% (质量分数).系统研究氢致Ti?6Al?4V合金动态相变过程及相应的机制.当氢含量增大时,β相转变温度显著降低,但幅度趋缓,并且β相体积分数逐渐增加.在加热过程中,置氢Ti?6Al?4V合金的相转变可以分为三个阶段,具体的过程是:δ→α+H2↑?δ+α′→βH?α′→αH+βH?αH→α+H2↑?α→β?βH→β+H2↑.另外,也对氢含量与α′马氏体的Ms和Mf的关系进行研究.%The hydrogen-induced microstructure evolution and phase transformations in Ti?6Al?4V alloy during heating and cooling were studied. The specimens were heated to 1273 K and subsequently cooled to room temperature. The hydrogen content is up to 0.8% (mass fraction). The hydrogen-induced dynamic phase transformations and the corresponding mechanisms were analyzed. When the hydrogen content increases, theβ transus temperature significantly decreases and the magnitude decreases, and the volume fraction ofβ phase increases. During heating, the phase transformations in hydrogenated Ti?6Al?4V alloys can be divided into three stages, and the phase transformation order isδ→α+H2↑?δ+α′→βH?α′→αH+βH?αH→α+H2↑?α→β?βH→β+H2↑. In addition, the relationship among hydrogenation andMs andMf ofα′ martensite were determined.
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