Microstructure and hardness investigation of 17-4PH stainless steel by laser quenching

Chen, Zhaoyun; Zhou, Guijuan; Chen, Zhonghua

doi:10.1016/j.msea.2011.12.004

Cited by 54 publications

(15 citation statements)

References 14 publications

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“…The wrought sheet microstructure ( Figure 2c) heat-treated to the H900 condition shows a matrix of lath martensite with uniformly distributed equiaxed particles that appear bright in the image. Murayama et al (1999) and Chen et al (2012) have shown that these equiaxed particles are associated with the MC-type Nb carbides expected in heat treated 17-4PH. The as-heat-treated AM microstructures from both vendors (Figure 2a and 2b) show predominantly martensitic microstructures with similar dispersed submicron Nb-rich second phase as observed in the wrought material.…”

Section: Materials and Specimen Designmentioning

confidence: 94%

High-throughput stochastic tensile performance of additively manufactured stainless steel

Bradley

Rodelas

Madison

et al. 2017

Journal of Materials Processing Technology

129

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An adage within the Additive Manufacturing (AM) community is that-complexity is free‖. Complicated geometric features that normally drive manufacturing cost and limit design options are not typically problematic in AM. While geometric complexity is usually viewed from the perspective of part design, this advantage of AM also opens up new options in rapid, efficient material property evaluation and qualification. In the current work, an array of 100 miniature tensile bars are produced and tested for a comparable cost and in comparable time to a few conventional tensile bars. With this technique, it is possible to evaluate the stochastic nature of mechanical behavior. The current study focuses on stochastic yield strength, ultimate strength, and ductility as measured by strain at failure (elongation). However, this method can be used to capture the statistical nature of many mechanical properties including the full stress-strain constitutive response, elastic modulus, work hardening, and fracture toughness. Moreover, the technique could extend to strain-rate and temperature dependent behavior. As a proof of concept, the technique is demonstrated on a precipitation hardened stainless steel alloy, commonly known as 17-4PH, produced by two commercial AM vendors using a laser powder bed fusion process, also commonly known as selective laser melting. Using two different commercial powder bed platforms, the vendors produced material that exhibited slightly lower strength and markedly lower ductility compared to wrought sheet. Moreover, the properties were much less repeatable in the AM materials as analyzed in the context of a Weibull distribution, and the properties did not consistently meet minimum allowable requirements for the alloy as established by AMS. The diminished, stochastic properties were examined in the context of major contributing factors such as surface roughness and internal lack-of-fusion porosity. This high-throughput capability is expected to be useful for follow-on extensive parametric studies of factors that affect the statistical reliability of AM components.

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Section: Materials and Specimen Designmentioning

confidence: 94%

High-throughput stochastic tensile performance of additively manufactured stainless steel

Bradley

Rodelas

Madison

et al. 2017

Journal of Materials Processing Technology

129

View full text Add to dashboard Cite

show abstract

“…[8] These dispersed particles are associated with the MC-type Nb-rich carbides/carbonitrides expected in 17-4PH. [9,10] Solute homogenization and phase transformations occurring during the solution and age heat treatments results in a microstructure devoid of original solidification features. Generally, the microstructure is qualitatively similar to wrought product.…”

Section: Methodsmentioning

confidence: 99%

Extreme‐Value Statistics Reveal Rare Failure‐Critical Defects in Additive Manufacturing

et al. 2017

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Additive manufacturing enables the rapid, cost effective production of customized structural components. To fully capitalize on the agility of additive manufacturing, it is necessary to develop complementary high-throughput materials evaluation techniques. In this study, over 1000 nominally identical tensile tests are used to explore the effect of process variability on the mechanical property distributions of a precipitation hardened stainless steel produced by a laser powder bed fusion process, also known as direct metal laser sintering or selective laser melting. With this large dataset, rare defects are revealed that affect only %2% of the population, stemming from a single build lot of material. The rare defects cause a substantial loss in ductility and are associated with an interconnected network of porosity. The adoption of streamlined test methods will be paramount to diagnosing and mitigating such dangerous anomalies in future structural components.

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“…With the characteristics of anti-corrosion, resist-to-abrasion and high mechanical strength, 05Cr17Ni4Cu4Nb martensitic stainless steel is widely used in structural components of the equipment in marine construction, chemical industries and power plants with a year-to-year consumption increase [1]. Recently, many studies about 05Cr17Ni4Cu4Nb martensitic stainless steel focus on its heat treatment processes, surface coating methods or the properties during additive manufacturing [2][3][4][5]. Generally, hot forging process is the effective method to form the shape and refine the grains for the parts made of 05Cr17Ni4Cu4Nb steel.…”

Section: Introductionmentioning

confidence: 99%

Flow stress modeling, processing maps and microstructure evolution of 05Cr17Ni4Cu4Nb Martensitic stainless steel during hot plastic deformation

Zhou

Feng

et al. 2020

Mater. Res. Express

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The hot deformation behavior of 05Cr17Ni4Cu4Nb stainless steel at the temperatures from 950°C to 1250°C and strain rates from 0.01 s −1 to 5 s −1 was investigated on the basis of test data obtained by Gleeble1500D thermo-simulation machine. A two-stage flow stress constitutive model incorporating the effects of the strain rate and temperature on the deformation behavior is proposed. The stressstrain relations of 05Cr17Ni4Cu4Nb steel predicted by the proposed model agree well with the experimental results. Moreover, the hot processing maps are also investigated. Combined with the microstructure evolution analysis, the appropriate hot forming processing parameters of 05Cr17Ni4-Cu4Nb steel is proposed in the temperature range of 1000-1100°C and strain rate range of 0.01-0.02 s −1 .

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Microstructure and hardness investigation of 17-4PH stainless steel by laser quenching

Cited by 54 publications

References 14 publications

High-throughput stochastic tensile performance of additively manufactured stainless steel

High-throughput stochastic tensile performance of additively manufactured stainless steel

Extreme‐Value Statistics Reveal Rare Failure‐Critical Defects in Additive Manufacturing

Flow stress modeling, processing maps and microstructure evolution of 05Cr17Ni4Cu4Nb Martensitic stainless steel during hot plastic deformation

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