等温温度对T91钢TLP双温连接接头组织性能的影响

陈思杰; 葛利玲; 井晓天

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等温温度对T91钢TLP双温连接接头组织性能的影响
陈思杰^1,2, 葛利玲², 井晓天²
1.河南理工大学, 材料科学与工程学院, 河南焦作 4540003;2.西安理工大学, 材料科学与工程学院, 西安 710048

摘要:

采用FeNiCrSiB(A)合金箔作中间层,氩气保护,对马氏体耐热钢T91钢管进行了瞬时液相扩散双温工艺连接.用电子万能材料试验机测试了接头的抗拉强度和弯曲性能,用扫描电镜、电子探针和显微硬度计分析了不同温度梯度TLP扩散连接接头的显微组织、元素分布和接头区域显微硬度.结果表明,利用FeNiCrSiB(A)中间层合金可以实现T91钢的连接,双温工艺的温度梯度对接头组织性能有很大影响,在加热温度为1270℃保温0.5 min、等温凝固温度1230℃保温3 min工艺条件下,获得的瞬时液相双温连接接头组织性能最好。

关键词: T91钢瞬时液相扩散等温温度双温工艺显微组织

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基金项目:西安市科学技术计划资助项目(Y07059);河南理工大学引进人才基金资助项目(648282)

Effects of TLP bonding temperature on the microstructurs and properties of T91 joint with two-step heating process

CHEN Sijie^1,2, GE Liling², JING Xiaotian²

1.School of Materials Science & Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China;2.School of Materials Science & Engineering, Xi'an University of Technology, Xi'an 710048, China

Abstract:

A modified 9Cr-1Mo(martensitic T91 steel pipes) were joined by transient liquid-phase bonding with two-step heating process using FeNiCrSiB(A) filler in argon atmosphere.The tensile strength and bend properties of the TLP joint were examined at room temperature.The microstructures and the element distributions as well as hardness of the joints with TLP two-step heating process were also investigated by means of SEM, EPMA and microhardness meter.The testing results indicate that the temperature gradient of TLP two-step heating process has prodigious effect on microstructures and properties of the joint.The microstructures and properties of TLP joint are best with the process at 1 270℃ heating for 0.5 min, and at 1 230℃ isothermal for 3 min.

Key words: T91 TLP bonding isothermal temperature two-step heating microstructure