Microstructure and mechanical properties of 15-5 PH stainless steel under different aging temperature

Abstract

The influence of aging temperature on microstructure and mechanical properties of Cr15Ni5 precipitation hardening stainless steel (15-5 PH stainless steel) were investigated at aging temperature range of 440–610 °C. The tensile properties at ambient temperature of the 15-5 PH stainless steel processed by different aging temperatures were tested, and the microstructural features were further analyzed utilizing optical microscope (OM), transmission electron microscope (TEM), electron backscatter diffraction (EBSD) as well as X-ray diffraction (XRD), respectively. Results indicated the strength of the 15-5 PH stainless steel was firstly decreased with increment of aging temperature from 440 to 540 °C, and then increased with the increment of aging temperature from 540 to 610 °C. The strength and ductility were well matched at aging temperature 470 °C, and the yield strength, tensile strength as well as elongation were determined to be 1170 MPa, 1240 MPa and 24%, respectively. The microstructures concerning to different aging temperatures were overall confirmed to be lath martensite. The strengthening mechanisms induced by dislocation density and the second phase precipitation of Cu-enriched metallic compound under different aging temperatures were determined to be the predominant strengthening mechanisms controlling the variation trend of mechanical properties corresponding to different aging temperatures with respect to 15-5 PH stainless steel.

Atomic‐Scale Study on the Interaction Mechanism between Cracking and Typical Grain Boundaries in 15‐5 PH Stainless Steel

“…The material used in present study was 15‐5 PH stainless steel, and the chemical composition is depicted in Table 1 . The fabrication process and processing parameters associated with the smelting process, forging process, and heat‐treatment process of studied 15‐5 PH stainless steel were described by us previously, [ 22 ] and samples processed at aging temperature of 510 °C were selected as the investigated target. To detect and analyze the OR of the studied alloy, electron back‐scatter diffraction (EBSD) analysis was performed using a field emission scanning electron microscopy (model: Zeiss Ultra55) after electropolishing with 10% perchloric acid in ethanol (polishing voltage: 30 V, polishing time: 30 s, step size: 0.2 μm).…”

The Microstructure and Mechanical Properties of a 15-6 PH Stainless Steel with Improved Thermal Aging Embrittlement Resistance

“…Due to its good welding performance, high mechanical strength, and good corrosion resistance, martensitic precipitation hardening stainless steel with low carbon content, particularly Cu-added 17-4 PH stainless steel and 15-5 PH stainless steel, has been extensively employed in harsh environments, such as in the petroleum, chemical, and nuclear energy industries [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. As a kind of typical precipitation alloy, this material can be hardened by fine precipitates with a high number density after a series of thermal treatments, including high temperature solution treatment (usually at 1040 °C for 1–4 h), then multi-stage aging at temperatures between 450 °C and 620 °C for several hours.…”