文章信息/Info

Title:

Effect of Heat Treatment on Microstructure and Mechanical Properties of High Strength Titanium Alloy

文章編號:

1674—3962 (2019)04-0000-00

作者:

王富強1;  張瑞雪2;  楊立新1;  王曉巍1;  馬英杰3;  黃森森3;  雷家峰3

1. 沈陽飛機工業(集團)有限公司, 遼寧 沈陽 110850 2. 東北大學材料科學與工程學院, 遼寧 沈陽 110819 3. 中國科學院金屬研究所 師昌緒先進材料創新中心, 遼寧 沈陽 110016

Author(s):

WANG Fuqiang1;  ZHANG Ruixue2;  YANG Lixin1;  WANG Xiaowei1; MA Yingjie3;  Huang Sensen3;  LEI Jiafeng3

1. Shenyang Aircraft Industry (Group) Co. , Ltd. , Shenyang 110850, China 2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 3. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016, China

關鍵詞:

高強鈦合金;  熱處理;  晶粒尺寸;  晶界粗化;  力學性能

Keywords:

high strength titanium alloy;  heat treatment;  grain size;  grain boundary coarsening;  mechanical properties

分類號:

TG156.1

DOI:

10.7502/j.issn.1674-3962.202109020

文獻標志碼:

A

摘要:

近β 高強鈦合金廣泛應用于航空航天領域, 通過顯微組織調控獲得良好的強韌性匹配是高強鈦合金的研究重點。以一種新型近β 鈦合金為研究對象, 通過調控熱處理制度獲得不同β 晶粒尺寸及不同晶界形貌的組織, 分別研究了β 晶粒尺寸隨固溶時間的變化規律、兩階段固溶過程晶界的粗化行為以及晶粒尺寸及晶界形貌對合金力學性能的影響。結果表明: β 相區固溶時間延長導致β 晶粒尺寸增加, 但對合金拉伸及沖擊性能沒有顯著影響; 兩階段固溶中α+β 相區固溶時初生α 相優先沿晶界析出并長大, 使晶界粗化, α+β 相區固溶溫度越低晶界粗化效果越明顯; 晶界粗化同時降低合金的強度與塑性, 但對沖擊韌性沒有顯著影響。

Abstract:

The near β high-strength titanium alloy is widely used in the aerospace field. Microstructure control is being focused on to achieve a good match between strength and toughness of high-strength titanium alloys. The size of β grains and the morphology of grain boundaries of a novel near β titanium with different heat treatments were characterized in this paper.The grain size was affected by the solution time, and the behavior of grain boundary coarsening was affected by (α+β) phase region solution. The effect of grain size and the morphology of grain boundary on mechanical properties were studied. The results show that the β grains grow up gradually with the extension of solution time in β phase region, and the size of β grains has no significant effect on tensile property and impact toughness. In the process of two-stage solution, the primary α phase precipitates preferentially along the grain boundary, which coarsen the grain boundary. The lower temperature in the (α+β) phase region solution, the more obvious the grain boundary coarsening. The grain boundary coarsening reduces the strength and plasticity of at the same time, but has no significant effect on the impact toughness.