Hot forging of Mg-4Al-2Ba-2Ca (ABaX422) alloy and validation of processing map

Mg−4Al−2Ba−2Ca (ABaX422)合金的熱鍛及熱加工圖的構建

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

  • K. SURESH
  • K. P. RAO
  • Y. V. R. K. PRASAD
  • N. HORT
  • H. DIERINGA

Detail(s)

Original languageEnglish
Pages (from-to)1495-1503
Journal / PublicationTransactions of Nonferrous Metals Society of China
Volume28
Issue number8
Online published29 Aug 2018
Publication statusPublished - Aug 2018

Abstract

A cup-shaped component of Mg-4Al-2Ba-2Ca (ABaX422) alloy was forged in the temperature range of 300-500 °C and at speeds in the range of 0.01-10 mm/s with a view to validate the processing map and study the microstructural development. The process was simulated through finite-element method to estimate the local and average strain rate ranges in the forging envelope. The processing map exhibited two domains in the following ranges: (1) 300-390 °C and 0.0003-0.001 s-1, and (2) 400-500 °C and 0.0003-0.3 s-1 and both represented dynamic recrystallization (DRX). The map revealed a wide flow instability regime at higher strain rates and temperatures lower than 400 °C, in which flow localization occurred. Forgings produced under conditions of the above two domains were sound and symmetrical, and had finer grain sizes when being forged in the first domain. However, when being forged in the flow instability regimes, the alloy fractured before the final shape was reached. The experimental load-stroke curves for the conditions within the domains correlated well with the simulated ones, whereas the curves obtained in the instability regime were uneven.
將Mg−4Al−2Ba−2Ca (ABaX422) 合金在300~500 °C 的溫度範圍內、0.01~10 mm/s的加工速率下熱鍛成杯型件,構建其熱加工圖,並研究其顯微組織的演變。採用有限元法對該工藝進行模擬,估計加工餘量的局部應變速率和平均應變速率範圍。熱加工圖存在以下2個區域:(1) 300~390 °C,0.0003~0.001 s−1;(2) 400~500 °C,0.0003~0.3 s−1;這2個區域都存在動態再結晶(DRX)。該圖表明,在高應變速率和低於400 °C的溫度下存在大範圍的流動失穩區,在此區域會發生流動局部化。在上述2個區域條件下製備的鍛件完好且組織均勻,在第一個區域條件下鍛造所獲鍛件的晶粒尺寸更小。然而,當在流動失穩區鍛造時,合金在最終成形前發生斷裂。實驗結果表明,上述2個區域條件下的荷載−行程曲線與類比曲線吻合較好,而在失穩區獲得的曲線則不平坦。

Research Area(s)

  • magnesium alloy, processing map, hot forging, dynamic recrystallization, FINITE-ELEMENT SIMULATION, MECHANICAL-PROPERTIES, MAGNESIUM ALLOYS, MICROSTRUCTURE, DEFORMATION, ANISOTROPY, FLOW, PARAMETERS, PLATE

Citation Format(s)

Hot forging of Mg-4Al-2Ba-2Ca (ABaX422) alloy and validation of processing map. / SURESH, K.; RAO, K. P.; PRASAD, Y. V. R. K.; HORT, N.; DIERINGA, H.

In: Transactions of Nonferrous Metals Society of China, Vol. 28, No. 8, 08.2018, p. 1495-1503.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review