文章信息/Info

Title:

Influence of Hot Die Deformation Rates on Microstructure and Mechanical Properties of TC18 Titanium Alloy

作者:

王華

（海軍裝備部，陜西 西安 710021）

Author(s):

WANG Hua

（ Navy Equipment Department， Xi�餫n 710021， China)

關鍵詞:

TC18; 鈦合金鍛件; 模鍛變形速率; 顯微組織; 力學性能

Keywords:

TC18;  titanium alloy forge piece;  die deformation rate;  microstructure;  mechanical properties

DOI:

10.7502/j.issn.1674-3962.2018.11.11

文獻標志碼:

A

摘要:

研究了TC18鈦合金不同模鍛變形速率條件對顯微組織及力學性能的影響規(guī)律。結果表明：較低模鍛變形速率促進TC18鈦合金β晶粒的動態(tài)再結晶過程，形成具有破碎的晶界α相的網籃組織，該組織斷口具有韌性斷裂組織特征，具有優(yōu)異的塑性和斷裂韌性；在較高變形速率條件下僅發(fā)生動態(tài)回復過程，形成具有平直的晶界α相的網籃組織，該組織塑性和斷裂韌性均較低，斷口呈冰糖狀解理斷裂組織特征；TC18鈦合金強度性能對變形速率不敏感。

Abstract:

The influence of die deformation rates (range from 2 mm/s to 10 mm/s) on microstructure and mechanical properties of TC18 titanium alloy was investigated. The results showed that the low die deformation rate promoted the dynamic recrystallization of TC18 titanium alloy. The basket�瞱ave microstructure with broken grain boundary α phase was formed. The fractography characterization showed ductility dimple and the forged sample possessed excellent ductility and KIC fracture toughness. While only the dynamic recovery occurred during high die deformation rate, which produced the basket�瞱ave microstructure with straightness grain boundary α phase. The fractography characterization showed brittle cleavage and the forged sample possessed low ductility and KIC fracture toughness. The strength properties have insensitivity on the die deformation rates.