Application and Characteristics of Low-Carbon Martensitic Stainless Steels on Turbine Blades

Lee, Hwa Teng; Liu, Feng Ming; Hou, Wun Hsin

doi:10.2320/matertrans.m2014307

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…On the other hand, high-temperature tempering decomposes martensite and forms coarse precipitation carbides, making it applicable to the environments where toughness and ductility are important. As mentioned the above conventional cast MSS 410 material, its applications and heat treatment processes are well defined and reported to be utilized in industrial needs [13,14].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Laser Direct Energy Deposited Martensitic Stainless Steel 410

KANG,

Lee,

et al. 2024

Preprint

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The aim of this work is to study the phase transformations, microstructures and mechanical properties of the martensitic stainless steel (MSS) 410 deposits produced by laser powder-directed energy deposition (LP-DED) additive manufacturing. The LP-DED MSS 410 deposits underwent the post heat treatment in austenitizing at 980℃ for 3hrs and followed by different tempering treatment at the temperatures of 250, 600, and 750℃ for 5hrs, respectively. The analyses of phase transformations and microstructural evolutions of LP-DED MSS 410 were carried out using X-ray diffraction, SEM-EDS, and EBSD. Vickers hardness and tensile strength properties were also measured to analyze the effects of the different tempering heat treatments. It reveals that as-built MSS 410 has very fine lath martensite and high hardness of about 480HV1.0 and tensile strength of about 1280 MPa, but elongation was very lower than the post heat treated ones. Precipitations of chromium carbide (Cr23C6) were most commonly observed at the grain boundaries and the entire matrix at the tempering temperatures of 600℃ and 750℃. In general, the tensile strengths de-creased from 1381MPa to 688MPa as tempering temperatures increased up to 750℃ from 250℃. Additionally, as the tempering temperature increased, the chromium carbide and tempered mar-tensite structures became coarser.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Laser Direct Energy Deposited Martensitic Stainless Steel 410

KANG,

Lee,

et al. 2024

Preprint

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“…As a typical high-strength and corrosion-resistant stainless steel, 06Cr13Ni4Mo is widely used in hydraulic turbine flow parts [1][2][3]. These parts are driven by high-speed water flow to generate electricity, so there is generally a high requirement on the mechanical properties of 06Cr13Ni4Mo [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Novel Reticular Retained Austenite on the Weld Fusion Line of Low Carbon Martensitic Stainless Steel 06Cr13Ni4Mo and the Influence on the Mechanical Properties

Fan

Zhao²,

Zhao

et al. 2022

Metals

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When performing fluorescent magnetic particle testing in steel welding-repaired zones, as traditional viewpoint usually ascribes magnetic particle indications to discontinuous welding defects such as cracks, incomplete fusion, etc., welding-repaired zones showing indications of these defects are always judged to be unqualified. In this study, a novel reticular phase was identified on the weld fusion line of 06Cr13Ni4Mo. By selected area electron diffraction, it was proved to be an austenite. By roasting test, it was proved to be induced by the thermal effect of welding. Non-ferromagnetic reticular austenite reduces the overall magnetic permeability, leading to the presence of fluorescent magnetic particle indication. Though the mechanical properties of the welding repaired zone are changed by the reticular austenite with the yield strength, tensile strength, and microhardness decreasing to 571 MPa, 752 MPa, and 279, respectively, they still exceed the required values of standard specifications. 06Cr13Ni4Mo welding-repaired zones showing magnetic particle indications induced by reticular austenite are qualified and should be accepted.

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“…Type 410 martensitic stainless steels have been used in many mechanical parts owing to their hardening capabilities at high temperatures. These materials have been conventionally employed for mechanical parts, such as turbine blades in steam power plants (Lee et al, 2015), and their chemical composition has been modified to achieve high strength and toughness at high temperatures. In general, a small amount of alloying elements such as Ni, Mo, Nb, V and N has been selectively added depending on such required purposes (Nomoto et al, 2006;Rivaz et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Assessment of creep behavior using a damage-coupled model for martensitic stainless steel

Yoon

Kimura

Toku

et al. 2021

Mechanical Engineering Journal

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In this study, the Liu-Murakami (LM) creep damage-coupled model was considered to evaluate the creep properties of martensitic stainless steel. The degree of creep damage was examined at two temperatures (565 ℃ and 593 ℃) to assess mechanically and thermally activated processes. A series of high applied stresses (applied stress/ultimate strength 0.5) was considered for accelerated creep loadings. A full set of creep constants was determined by combining the Norton and LM models. Constitutive equations were used to quantitatively estimate experimental creep curves. The variation in creep constants was discussed based on stress sensitivity, such as stress triaxiality and applied stress, depending on the power of stress. The creep strain-time curves were successfully estimated. The comparison between the experimental and analytical results was in good agreement in the tertiary regime. In addition, the compensation of the two applied temperatures provides a supplementary explanation of the relationship between the ultimate strength and rupture time in terms of temperature sensitivity. The analytical results show that different applied stresses and temperatures could be compensated to characterize the creep behavior of the material. Thus, the creep strain-time and creep strain rate-certain rupture time curves were finally achieved. The analytical process in this study provides a laboratory-scale assessment of creep properties using the accelerated creep test and LM model.

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Application and Characteristics of Low-Carbon Martensitic Stainless Steels on Turbine Blades

Cited by 5 publications

References 6 publications

Microstructure and Mechanical Properties of Laser Direct Energy Deposited Martensitic Stainless Steel 410

Microstructure and Mechanical Properties of Laser Direct Energy Deposited Martensitic Stainless Steel 410

A Novel Reticular Retained Austenite on the Weld Fusion Line of Low Carbon Martensitic Stainless Steel 06Cr13Ni4Mo and the Influence on the Mechanical Properties

Assessment of creep behavior using a damage-coupled model for martensitic stainless steel

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