贺建超
,
张田仓
,
季亚娟
,
张传臣
材料热处理学报
研究了热处理温度对TC4/TC17钛合金线性摩擦焊接接头的组织和力学性能的影响.结果表明:在焊态下,接头焊合区TC17一侧为亚稳态的β相;TC4一侧为针状马氏体;界面处为细小的针状马氏体组织.经过热处理后,焊合区TC17一侧亚稳态β相析出细小的层片状α相,随着热处理温度的增加α相发生长大,片层厚度增加;焊合区TC4一侧经热处理后显微组织无明显变化.在本实验热处理温度范围内,热处理使焊合区TC17显微硬度增加,但随着热处理温度的升高,显微硬度下降.热处理对焊合区TC4一侧显微硬度无明显影响.
关键词:
异质接头
,
线性摩擦焊
,
微观组织
,
热处理
徐韦锋
,
张振林
中国有色金属学报(英文版)
doi:10.1016/S1003-6326(16)64445-X
研究 TC4/TA15异质钛合金激光焊焊缝的显微组织和力学性能。结果表明：TC4/TA15异质钛合金激光焊缝熔合区显微组织由针状α相和马氏体α′组成，TC4侧热影响区主要是残余α相和马氏体α′，TA15侧热影响区则出现了大量等轴α相。焊缝显微硬度呈现不对称特征，熔合区最高，TA15母材区最低。随应变速率由1×10?4 s?1增加到1×10?2 s?1，接头屈服强度和抗拉强度均升高，且满足 TC4母材>TC4/TC4同质接头>TA15母材>TA15/TA15同质接头>TC4/TA15异质接头，而硬化能力和应变硬化指数则降低。不同应变速率下拉伸 TC4/TA15异质接头均在 TA15母材断裂，断口呈现韧性断裂特征。
关键词:
激光焊
,
钛合金
,
异质接头
,
变应速率
,
显微组织
,
力学性能
薛钢
,
宫旭辉
,
王涛
,
方洪渊
,
高珍鹏
材料开发与应用
针对10Ni5CrMoV钢采用0Cr18Ni24Mo6N奥氏体焊条焊接形成的“铁素体-奥氏体-铁素体”异质接头,采用薄片试样疲劳试验研究了无加强高和带加强高两种情况下平面应力状态接头的疲劳行为,并建立了带加强高接头S-N疲劳曲线.结果表明,无加强高情况下疲劳裂纹在焊缝金属内启裂并扩展;带加强高情况下疲劳裂纹在焊趾处启裂、并近似垂直载荷方向在母材内扩展至断裂,寿命较无加强高情况大幅降低,且启裂寿命占疲劳总寿命的比例较高,达到70％-80％.
关键词:
平面应力
,
异质接头
,
疲劳性能
张勇
,
覃作祥
,
许鸿吉
,
常凯
,
陆兴
,
佟维
中国腐蚀与防护学报
T4003 and Q450NQR1, as well as Nirosta 4003 and Q450NQR1 dissimilar metal joints were welded by ER-309 welding wire. The microstructure oftheir base metal and joint were analyzed by metallographic approach. The corrosion resistance of base metal and joints was evaluated by salt fog and electrochemical corrosion tests. The results demonstrated that as far as the similar metal joints of Nirosta 4003 and T4003 was concerned, the corrosion resistance of welding line was much better than that of base metal. However, the corrosion resistance of heat affected zone (HAZ) became worse. In the case of dissimilar metal joints of Nirosta 4003 and Q450NQR1, as well as T4003 and Q450NQR1, the corrosion resistance of welding line was reduced. Under salt spray condition, the corrosion resistance of welding line and base metal of similar metal joints was comparative. However, the dissimilar metal joints of Nirosta 4003 and Q450NQR1, as well as T4003 and Q450NQR1 exhibited obvious corrosion. Especially, abundant corrosion pits were found near the side of Q450NQR1. Due to the different corrosion voltages of stainless steel, weathering steel, HAZ, and welding line, a series of micro-batteries were formed in the dissimilar metal joints, which worsened the corrosion of weathering steel.
关键词:
铁素体不锈钢
,
weathering steel
,
dissimilar metal joint
,
corrosion resistance
