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不同鑄型對(duì)鈦合金微觀組織及力學(xué)性能的影響
作者:
作者單位:

1.西安科技大學(xué);2.河南工學(xué)院

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中圖分類號(hào):

TG241；TG249.5

基金項(xiàng)目:

國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Effect of Different Molds on Microstructure and Mechanical Properties of Titanium Alloys
Author:
Affiliation:

1.Xi''an University of Science and Technology;2.xi''an University of Science and Technology;3.Henan Institute of Technology

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    摘要:

    為了研究陶瓷和石墨鑄型對(duì)ZTC4鈦合金微觀組織機(jī)理的影響，本文采用數(shù)值模擬與實(shí)驗(yàn)分析相結(jié)合的方法，研究了兩種鑄型的試樣在凝固傳熱過(guò)程中的冷卻速度、凝固速度、凝固時(shí)間對(duì)微觀組織和力學(xué)性能影響。結(jié)果表明：與陶瓷型試樣相比，石墨型的散熱效果好、冷卻速度快、凝固速度高，且石墨型的冷卻速度提高了52.04%，使得微觀組織為急冷生成的細(xì)小板條馬氏體α，晶粒較小、取向較多、凝固厚度大，導(dǎo)致力學(xué)性能中的屈服強(qiáng)度、抗拉強(qiáng)度、硬度分別提高了6.7%、2.6%和4.2%，但伸長(zhǎng)率和斷面收縮率分別降低了37%和34.5%。同時(shí)同種鑄型的不同位置對(duì)冷卻速度快慢的影響依次為：中間>底部>頂部。

    Abstract:

    The effects of different casting moulds on the microstructures and mechanical properties of ZTC4 titanium alloy were studied. The effects of cooling rate, solidification rate and solidification time on the microstructures and mechanical properties of ZTC4 titanium alloy were studied by numerical simulation and experimental analysis.The results show that compared with the ceramic sample, the graphite sample has better heat dissipation effect, faster cooling speed and higher solidification speed, which makes the microstructure of the sample to be fine lath martensite alpha produced by quenching, with smaller grain size, more orientation and larger solidification thickness.The yield strength, tensile strength and hardness of the mechanical properties increased by 6.7%, 2.6% and 4.2% respectively, but the elongation and section shrinkage decreased by 37% and 34.5%, respectively. At the same time, different positions of the same mold have some influence on the cooling rate. The cooling rate at different positions of the sample is in the order of middle > bottom > top.

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宗學(xué)文,劉文杰,高中堂,徐文博,高倩,王磊.不同鑄型對(duì)鈦合金微觀組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2020,49(5):1681~1688.[宗學(xué)文,liu wenjie, gao zhongtang, xu wenbo, Gao qian, wang lei. Effect of Different Molds on Microstructure and Mechanical Properties of Titanium Alloys[J]. Rare Metal Materials and Engineering,2020,49(5):1681~1688.]
DOI：10.12442/j. issn.1002-185X.20190596

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  • 收稿日期:2019-07-15
  • 最后修改日期:2019-09-10
  • 錄用日期:2019-10-11
  • 在線發(fā)布日期: 2020-06-05
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