氢转化炉用Cr25Ni35NbM合金异种焊缝的显微组织表征及力学行为

Jingfeng Guo, Wenwen Liu, Chunxiu Li, Xiaoming Zhang
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引用次数: 5

摘要

研究了Cr25Ni35NbM/15CrMo和Cr25Ni35NbM/SUS321异种焊接接头的显微组织表征和力学行为。通过光学显微镜(OM)、扫描电镜(SEM)和电子万能拉伸试验机对不同焊接接头的显微组织、室温和高温(1173 K)拉伸强度进行了分析。Cr25Ni35NbM/15CrMo异种焊缝中15CrMo钢的热影响区组织由铁素体-珠光体转变为铁素体-马氏体。在Cr25Ni35NbM/SUS321异种焊接接头中,在SUS321奥氏体不锈钢的热影响区内析出了大量的α相。室温下,两种异种焊缝的抗拉强度和屈服强度均小于Cr25Ni35NbM合金同类焊缝。两种异种焊缝的高温抗拉强度均小于Cr25Ni35NbM合金同类焊缝。室温和高温下,两种异种焊缝的断裂部位分别为母材15CrMo和SUS321不锈钢的热影响区。结果表明,Cr25Ni35NbM合金异种焊缝接头的薄弱部位是低性能贱金属15CrMo和SUS321不锈钢。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructural characterization and mechanical behavior of Cr25Ni35NbM alloy dissimilar weld joint for application in a hydrogen reformer furnace
The microstructural characterization and mechanical behavior of Cr25Ni35NbM/15CrMo and Cr25Ni35NbM/SUS321 dissimilar weld joints were studied in this paper. The microstructure, room temperature and high temperature (1173 K) tensile strength of dissimilar weld joints were analyzed through optical microscopy (OM), scanning electron microscopy (SEM) and electronic universal tensile testing machine. The microstructure of HAZ in 15CrMo steel of Cr25Ni35NbM/15CrMo dissimilar weld joint transformed from ferrite-pearlite into ferrite-martensite. A large volume fraction of α phase was found to have precipitated in the HAZ of SUS321 austenitic stainless steel for Cr25Ni35NbM/SUS321 dissimilar weld joint. At room temperature, the tensile strength and yield strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. The high temperature tensile strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. Both at room and high temperature, the fracture locations of two types dissimilar weld joints are the HAZ of the base metal 15CrMo and SUS321 stainless steel, respectively. It indicates that the weak part of the Cr25Ni35NbM alloy dissimilar weld joints is the low-performance base metals 15CrMo and SUS321 stainless steel.
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