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基于加工圖的塑性失穩(wěn)準(zhǔn)則比較研究
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A Comparative Study of Various Flow Instability Criteria in Processing Map
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the Nation “973” Project of China (2007CB613807); the New Century Excellent Talents in University (NCET-07-0696); the fund of the State Key Laboratory of Solidification Processing in NWPU (35-TP-2009)

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    摘要:

    介紹基于加工圖理論的各種塑性失穩(wěn)準(zhǔn)則，比較分析各個(gè)準(zhǔn)則的區(qū)別，以及各參數(shù)的物理意義，并以Ti2AlNb基合金為研究對(duì)象建立Prasad、Murty、Gegel和Malas準(zhǔn)則的熱加工圖。結(jié)合試驗(yàn)結(jié)果分析和對(duì)比4種塑性失穩(wěn)準(zhǔn)則下加工圖的區(qū)別發(fā)現(xiàn)：Prasad和Murty準(zhǔn)則的塑性失穩(wěn)圖相似，均位于高應(yīng)變速率區(qū)，且Murty準(zhǔn)則的塑性失穩(wěn)區(qū)稍窄；Gegel和Malas準(zhǔn)則的塑性失穩(wěn)圖相似，塑性失穩(wěn)區(qū)比Prasad和Murty準(zhǔn)則的明顯偏大，除高應(yīng)變速率外，還能預(yù)測(cè)高溫低應(yīng)變速率的塑性失穩(wěn)現(xiàn)象；解釋可能出現(xiàn)各種失穩(wěn)現(xiàn)象的原因，并結(jié)合各種塑性失穩(wěn)準(zhǔn)則提出判斷材料塑性變形失穩(wěn)的選用原則。

    Abstract:

    Four instability criteria, namely Murty, Gegel, Malas and Prasad criteria, were compared, and the physical significance of parameters was analyzed in this paper. It is indicated that the instability map developed by Murty criterion is similar to Prasad criterion, showing an unstable flow at high strain rates. Murty criterion exhibits a little narrower unstable region. The instability maps developed by Malas criterion and Gegel criterion have similar shapes, and the unstable regions are wider than those Prasad criterion and Murty criterion. In addition to the unstable flow at high strain rates as predicted by Murty criterion and Prasad criterion, Malas criterion and Gegel criterion have a good ability for predicting unstable flow at high temperatures and low strain rates. The processing maps were validated by hot compression tests of Ti-22Al-25Nb alloy, and the possible causes of various instability were discussed.

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馬 雄,曾衛(wèi)東,孫 宇,趙永慶,王邵麗,周義剛.基于加工圖的塑性失穩(wěn)準(zhǔn)則比較研究[J].稀有金屬材料與工程,2010,39(5):756~761.[Ma Xiong, Zeng Weidong, Sun Yu, Zhao Yongqing, Wang Shaoli, Zhou Yigang. A Comparative Study of Various Flow Instability Criteria in Processing Map[J]. Rare Metal Materials and Engineering,2010,39(5):756~761.]
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  • 收稿日期:2009-05-05
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