时效对T23耐热钢TLP连接接头组织与性能的影响
Effect of Aging on Microstructure and Properties of TLP Holding Joint with T23 Heat-resistance Steel
黄建新, 葛利玲, 井晓天
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作者单位：西安理工大学 材料科学与工程学院, 陕西 西安 710048
中文关键字：T23耐热钢； TLP连接； 时效； 双温工艺
英文关键字：T23 heat-resistance steel; TLP holding; aging; double temperature process
中文摘要：用FeNiCrSiB合金箔作中间层，氩气保护，在焊接双温工艺(加热温度1240 ℃， 保温50 s ，等温凝固温度1210 ℃，保温4 min，压力6 MPa)条件下，对T23耐热钢管进行TLP连接。然后对焊接试样进行700 ℃、不同时间的时效试验。利用力学性能试验机对接头拉伸性能进行测试，利用金相显微镜、显微硬度计分析不同时效时间后TLP连接接头的显微组织和接头区域显微硬度。结果表明：接头经700 ℃×500 h时效后，中间层元素进一步向母材扩散，接头组织成分均匀化增强，焊缝与母材硬度的差异明显缩小，接头的拉伸性能合格，断裂位置均位于远离焊缝的母材区域，从而保证了接头在时效后性能的稳定。
英文摘要：Taking FeNiCrSiB amorphous alloy as interlayer in argon atmosphere, the T23 heat-resistance steel pipes were jointed by transient liquid-phase bonding using two-step heating process in argon atmosphere: bonded at 1240℃for 50 s, and isothermal congealed at 1210℃for 4 min. Then the welded samples were aged at 700℃ for different time. The mechanical properties of the testing sample were checked by mechanical properties tester, moreover, the microstructure and hardness of the joints were examined by OM and microhardness machine. The results show that the welded sample after aging at 700℃ for 500 h, the interface layer element is diffusing to base metal, the microstructure reactant of joint is more and more uniform, the difference of hardness between welded joint and base metal is minimized. The tensile strength is standard. The failure position is at base metal.