新聞資訊
GH4742高溫合金的動態(tài)再結(jié)晶行為
發(fā)布人：上海艾荔艾金屬材料有限公司m.85978597.cn
更新時間：2015-08-25
采用Gleeble-1500D熱模擬機對GH4742高溫合金進行高溫壓縮試驗，觀察該合金的金相組織和TEM顯微組織并進行對比分析，研究該合金的動態(tài)再結(jié)晶行為。
GH4742高溫合金的動態(tài)再結(jié)晶行為Dynamic recrystallization behavior of GH4742
superalloy
采用Gleeble-1500D熱模擬機對GH4742高溫合金進行高溫壓縮試驗，觀察該合金的金相組織和TEM顯微組織并進行對比分析，研究該合金的動態(tài)再結(jié)晶行為。結(jié)果表明：小應(yīng)變速率、大變形程度及高變形溫度均促進了該合金動態(tài)再結(jié)晶的進行，第二相粒子通過影響位錯的運動來影響合金的動態(tài)再結(jié)晶行為；晶界弓出機制是GH4742高溫合金動態(tài)再結(jié)晶的主要形核方式，部分孿晶通過疊加方式形核；通過對真應(yīng)力—真應(yīng)變曲線數(shù)據(jù)的計算擬合，構(gòu)建了GH4742高溫合金動態(tài)再結(jié)晶模型。
Hot compression tests of GH4742 superalloy were conducted
on a Gleeble-1500D thermal simulating tester. Metallographs and TEM images were
observed and compared, and dynamical recrystallization behavior was
investigated. The results show that the dynamical recrystallization (DRX) of the
alloy is promoted when the strain rate is small, the true strain is big and the
temperature is high. The DRX behavior is affected by the second phase through
which the movement of dislocation is influenced. The main nucleation mechanism
of DRX in the present alloy is grain boundary bowing nucleation and the other
nucleation mechanism is twin superposition nucleation. The DRX modeling of this
alloy is established by means of mathematic fitting data based on true
stress—true strain curves.
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