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Haynes 230合金熱變形組織演化規(guī)律研究
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Microstructure Evolution of Haynes230 Superalloy during Hot Deformation
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    摘要:

    采用Thermecmastor-Z型熱模擬機(jī)對Haynes230合金進(jìn)行變形溫度為950~1250 ℃，應(yīng)變速率為0.001～10 s-1范圍內(nèi)的高溫壓縮試驗(yàn)，并利用OM和TEM分析研究了熱變形組織演化特征和動態(tài)再結(jié)晶形核機(jī)制。結(jié)果表明：動態(tài)再結(jié)晶晶粒尺寸和體積分?jǐn)?shù)隨著變形溫度的升高而增大和增多，隨著應(yīng)變速率的升高而變小和減少；晶界弓出是合金動態(tài)再結(jié)晶的主要形核機(jī)制，項(xiàng)鏈組織在熱變形組織演化過程中起著重要作用；動態(tài)再結(jié)晶穩(wěn)態(tài)晶粒尺寸Dss與Z參數(shù)之間符合冪函數(shù)關(guān)系

    Abstract:

    Hot compression tests of Haynes230 superalloy were conducted using a Thermecmastor-Z simulator in the temperature range of 950~1250 oC and strain rates of 0.001~10 s-1. Optical microscope (OM) and transmission electron microscope (TEM) techniques were employed to investigate the microstructure evolution and nucleation mechanisms of dynamic recrystallization (DRX). Results show that both the size and volume fraction of DRX grains increase with the increasing of deformation temperature but decrease with the increasing of strain rate. The dominant nucleation mechanism of DRX is bulging of the original grain boundaries. The necklace structure of recrystallized grains along original grain boundaries plays an important role for nucleation and growth of DRX grains. The relationship between DRX steady state grain size and Zener-Holloman parameter can be well established by a power law function

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劉 毅,許 昆,羅錫明,陳登權(quán),李 偉,胡 銳,李金山. Haynes 230合金熱變形組織演化規(guī)律研究[J].稀有金屬材料與工程,2013,42(9):1820~1825.[Liu Yi, Xu Kun, Luo Ximing, Chen Dengquan, Li Wei, Hu Rui, Li Jinshan. Microstructure Evolution of Haynes230 Superalloy during Hot Deformation[J]. Rare Metal Materials and Engineering,2013,42(9):1820~1825.]
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  • 收稿日期:2012-09-18
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