為了提高對Ti6Al4V鈦合金激光焊接接頭中各微區(qū)的顯微組織和微區(qū)力學性能的理解,對不同焊接速度下接頭中顯微硬度曲線的分布趨勢及其與顯微組織和取向差之間的關(guān)系進行研究。從焊縫中心到母材,熔合線附近的顯微硬度值(Hm)最高。在同一接頭中,Hm隨著焊縫寬度增加而增加;在不同接頭中,Hm隨著不均勻度增加而增加。從焊縫到母材,隨著馬氏體含量減少和初始α相含量增多,顯微硬度逐漸降低。當顯微組織主要由馬氏體組成時,在較寬的焊縫中或在不同焊速接頭的焊縫中心,顯微硬度隨著冷卻速率、馬氏體大小和馬氏體的晶界取向差而變化;焊縫較窄時,冷卻速率等引起的顯微硬度的差異較小。

【文章頁數(shù)】：13 頁

【文章目錄】：
1 Introduction
2 Experimental
3 Results
    3.1 Microstructures of Ti6Al4V laser-welded joint
    3.2 Grain orientation of Ti6Al4V laser-welded joint
    3.3 Non-uniform microhardness distribution of welded joint at three different weldingspeeds
    3.4 Relationship between microhardness,micro-structure,and grain misorientation
        3.4.1 Comparison of different micro-areas in weld metal
        3.4.2 Comparison of weld center at different welding speeds
4 Discussion
    4.1 Microstructures and phase transformations in Ti6Al4V laser-welded joint
    4.2 Relationships between microhardness,weld width,and non-uniformity
    4.3 Relationships between microhardness,micro-structure,and misorientation
5 Conclusions



本文編號：3936966