-1~10-4 s-1條件下的高溫拉伸試驗(yàn)。從實(shí)驗(yàn)結(jié)果可得,TA32型鈦合金較高的溫度(650℃)依然能保持較好的綜合性能,在650℃~750℃區(qū)間內(nèi)應(yīng)變速率為10-1~10-3s-1條件下,變形呈現(xiàn)出明顯的加工硬化和再結(jié)晶現(xiàn)象,當(dāng)溫度升至800℃及以上時(shí)其塑性延伸率顯著提高而強(qiáng)度發(fā)生下降,同時(shí)出現(xiàn)了穩(wěn)態(tài)流動(dòng)應(yīng)力。隨后,本文基于統(tǒng)計(jì)學(xué)和正則化原理,提出一種修正本構(gòu)模型參數(shù)的方法,并建立了T32新型鈦合金的Arrhenius-type型應(yīng)力流變本構(gòu)模型。對(duì)比實(shí)驗(yàn)結(jié)果可知,相對(duì)于傳統(tǒng)的最小二乘法得到的模型,該修正方法得到的模型能有效地提高模型的精度。"/>

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TA32新型鈦合金高溫流變行為及本構(gòu)模型研究
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南京航空航天大學(xué)機(jī)電學(xué)院

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Research on Flow Behavior of TA32 Titanium Alloy at High Temperature and Constitutive Model
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College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics

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    為了研究TA32鈦合金的高溫流變行為,建立該材料本構(gòu)模型,本文對(duì)TA32鈦合金進(jìn)行了溫度范圍為650℃~850℃,應(yīng)變速率為10-1~10-4 s-1條件下的高溫拉伸試驗(yàn)。從實(shí)驗(yàn)結(jié)果可得,TA32型鈦合金較高的溫度(650℃)依然能保持較好的綜合性能,在650℃~750℃區(qū)間內(nèi)應(yīng)變速率為10-1~10-3s-1條件下,變形呈現(xiàn)出明顯的加工硬化和再結(jié)晶現(xiàn)象,當(dāng)溫度升至800℃及以上時(shí)其塑性延伸率顯著提高而強(qiáng)度發(fā)生下降,同時(shí)出現(xiàn)了穩(wěn)態(tài)流動(dòng)應(yīng)力。隨后,本文基于統(tǒng)計(jì)學(xué)和正則化原理,提出一種修正本構(gòu)模型參數(shù)的方法,并建立了T32新型鈦合金的Arrhenius-type型應(yīng)力流變本構(gòu)模型。對(duì)比實(shí)驗(yàn)結(jié)果可知,相對(duì)于傳統(tǒng)的最小二乘法得到的模型,該修正方法得到的模型能有效地提高模型的精度。

    Abstract:

    In order to study the flow behavior of TA32 titanium alloy and set up the constitutive model at high temperature, this paper carries out a tensile experiment at temperatures in the range of 650℃-850℃ and at strain rates of 0.1-0.0001s-1. The result indicated that the TA32 titanium alloy maintains a comprehensive performance at high temperature (about 650℃) . the behavior of tensile process at high temperature arises work hardening and dynamic recovery obviously at the range from 650℃ to 750℃ and low strain rate of 10-1-10-3s-1 while the elongation of TA32 increases enormously and strength decreases clearly as temperature rises to 800℃ . At the mean time, the steady stage of stress occurs. The constitutive model of Arrhenius-type was constructed by using a specific correction method based on statistic and regularization. The comparison shows a more accurate flow predicted stress through modified model against to the conventional least squares model.

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陳燦,陳明和,謝蘭生,龔宗輝. TA32新型鈦合金高溫流變行為及本構(gòu)模型研究[J].稀有金屬材料與工程,2019,47(3):827~834.[Chen Can, Chen Minghe, Xie Lansheng, Gong Zonghui. Research on Flow Behavior of TA32 Titanium Alloy at High Temperature and Constitutive Model[J]. Rare Metal Materials and Engineering,2019,47(3):827~834.]
DOI：10.12442/j. issn.1002-185X.20170646

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  • 收稿日期:2017-07-21
  • 最后修改日期:2017-09-29
  • 錄用日期:2017-11-09
  • 在線發(fā)布日期: 2019-04-10
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