TC4钛合金／不锈钢真空钎焊接头的界面组织及抗剪强度

摘要

TC4 and 1CrlSNi9Ti were brazed by using Ag-28%Cu brazing filler metal under the conditions of brazing temperature of 800-890℃and heating times of 2--25 rain, and the interracial mierostructure and shear strength were investigated. The results show that Ti elements in TC4 dissolved into brazing filler metal and diffused to the interface of brazing filler metal and stainless steel, FeTi+Cu phase was formed at the interface, and thus the problem for the brazing filler metal being difficult to wetting the stainless steel was solved. The interface structure of brazed joints was TC4/ Ti/ Ti2Cu/ TiCu/Ag+Cu/Ti4OCu60-xFex/TiFe/1Crl8NigTi. The maximum shear strength was 103 MPa when the brazing temperature was 830 ℃ and heating time was 5 vain.%在钎焊温度800-890℃、保温时间2～25min的条件下，采用Ag-28％Cu钎料对TC4钛合金与1Cr18Ni9Ti不锈钢进行真空钎焊，并对接头的界面组织及抗剪强度进行了研究。结果表明：由于TC4母材中的钛向钎料溶解并扩散到不锈钢与钎料的界面，形成了固溶Cu的FeTi相，解决了不锈钢难于被一般钎料润湿的问题；钎焊接头界面结构为TC4／Ti／Ti2Cu／TiCu／Ag＋Cu／Ti40Cu60-xFex／TiFe／不锈钢；在钎焊温度为830℃、保温时间为5rain的条件下，接头获得的抗剪强度最高，为103MPa。