The Joint Properties of A564-630 Stainless Steel Made by Transient Liquid Phase Bonding: Microstructural and Mechanical
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JMEPEG https://doi.org/10.1007/s11665-020-04962-z
The Joint Properties of A564-630 Stainless Steel Made by Transient Liquid Phase Bonding: Microstructural and Mechanical Strength Evaluation Mohammad J. Moradi, Esmaeil Emadoddin, and Hamid Omidvar (Submitted February 23, 2020; in revised form May 26, 2020) Nickel-based filler alloy with a liquidus temperature of 1024 °C was used for transient liquid phase (TLP) bonding of A564-630 martensitic precipitation hardening stainless steel. TLP experiments were carried out at a constant temperature of 1050 °C for different times between 30 to 90 min employing 75 lm thick filler metal to achieve the best TLP parameters. A Ni coating of 10 lm was coated to the base materials to compare the joints with and without coating. The effect of bonding conditions on the microstructure and mechanical properties of samples was investigated. The isothermal solidification was achieved after 60 min of bonding time. The results showed that bond shear strength increased with increasing the TLP time. The Ni coating improved the microstructure and shear strength of the joint and the Ni-coated base metal TLP bonded at 1050 °C for 90 min showed lap-shear strength of maximum 461 MPa. By comparing the results of the line scan analysis and the hardness profile, it is concluded that with increasing the TLP time, a more uniform distribution of alloying elements and hardness profile across the joint region was achieved. Keywords
microhardness, microstructure, Ni coating, precipitation hardening stainless steel A564-630, shear strength, transient liquid phase (TLP) bonding
1. Introduction A564-630 is one of the most commonly used stainless chromium-nickel alloy steels with copper additive, which are precipitation hardened with martensitic structure. It is characterized by high corrosion resistance while maintaining highstrength properties, including hardness. The material is used in energy, paper, aerospace, offshore, marine and food industries for different equipment parts, shafts, turbine blades, measuring devices, and fasteners (Ref 1-3). This steel is furnished in the annealed condition, which is conducted by heat treating at 10401065 C followed by air cooling to 25 C (Ref 4). A suitable heat treatment cycle must be applied before using this material. For instance, NACE MR0175 suggests a double aging (DH1150) heat treatment cycle which results in 862 MPa tensile strength, 724 MPa yield strength and 33 HRC maximum hardness (Ref 5). Joining is one of the major procedures for manufacturing and repairing parts. Cost and joint integrity are required and all industries try to select the best procedure for producing parts with optimum properties and durability (Ref 6). Due to the geometrical design of some industrial parts, there is no
Mohammad J. Moradi and Esmaeil Emadoddin, Faculty of Materials and Metallurgical Engineering, Semnan University, 35131-19111 Semnan, Iran; and Hamid Omidvar, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology, 424 Hafez Ave, 15875-441
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