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熱處理對(duì)TC21鈦合金顯微組織的影響
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西北工業(yè)大學(xué) 材料學(xué)院

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Effect of Heat Treatment on the Microstructure Development of TC21 Alloy
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Northwest Institute for Nonferrous Metal Research

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    摘要:

    對(duì)TC21鈦合金進(jìn)行雙重固溶+時(shí)效熱處理,研究固溶冷卻速率、溫度對(duì)合金顯微組織的影響。研究表明,初生α相形貌主要受一次高溫固溶溫度控制,高溫固溶冷卻速率對(duì)次生α相含量及長(zhǎng)寬比有顯著的影響。高的固溶冷卻速率可以保留更多的亞穩(wěn)定β相,從而在時(shí)效過(guò)程析出更多細(xì)小的次生α相,導(dǎo)致強(qiáng)度增加,塑性及韌性下降。二次低溫固溶溫度對(duì)合金后續(xù)的時(shí)效響應(yīng)有顯著的影響,高的固溶溫度可以保留更多的β相,促使更多細(xì)小的轉(zhuǎn)變?chǔ)料嘣跁r(shí)效中析出；低的固溶熱處理溫度導(dǎo)致固溶殘余β相相含量減小,時(shí)效敏感性降低。時(shí)效過(guò)程導(dǎo)致殘余β相的分解,特別是大塊亞穩(wěn)定β相區(qū)。

    Abstract:

    Micro-structural development of TC21 alloy after double alpha/beta solution and aging heat treatment was investigated. Primary alpha morphology was determined by the first solution treatment at the top of alpha/beta portion. Varying the cooling rates can significantly influence the volume fraction of retained beta phase and secondary alpha. Higher cooling rate resulted in greater retention of the beta phase and transformation of the phase into secondary alpha phase upon aging. This higher amount of fine, secondary alpha phase promoted higher strength and lower toughness. Second alpha/beta heat treatment temperature significantly influenced the heat treatment response of the microstructure. Higher heat treatment temperatures promoted greater amounts of retained beta with fine, transformed alpha in the final microstructures. Lower alpha/beta heat treatment temperatures promoted less responsive retained beta during aging process. Aging treatment promoted decomposition of retained beta phase, particularly in larger retained-beta regions that exhibited lower stability.

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侯智敏.熱處理對(duì)TC21鈦合金顯微組織的影響[J].稀有金屬材料與工程,2017,46(8):2087~2092.[houzhimin. Effect of Heat Treatment on the Microstructure Development of TC21 Alloy[J]. Rare Metal Materials and Engineering,2017,46(8):2087~2092.]
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  • 收稿日期:2015-07-14
  • 最后修改日期:2015-11-30
  • 錄用日期:2015-12-11
  • 在線發(fā)布日期: 2017-11-16
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