scholarly journals Formation and Evolution of DS-Type Inclusions in 15-5PH Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1129
Author(s):  
Zhonghua Zhan ◽  
Weifeng Zhang ◽  
Yanling Zhang ◽  
Ruxing Shi ◽  
Guoguang Cheng
Keyword(s):  
Stainless Steel ◽  
Solidification Process ◽  
Ladle Treatment ◽  
Composition Control ◽  
Vacuum Degassing ◽  
Large Size ◽  
Steel Castings ◽  
Refractory Composition ◽  
Formation And Evolution ◽  
Al Additions

15-5PH stainless steel castings are key components in fracturing trucks. However, DS-type inclusions can lead to fatigue failure of the material. To elucidate the formation mechanism of large-size DS-type inclusions, the evolution, growth, and aggregation of inclusions during vacuum oxygen decarburization, ladle refining, and vacuum casting were studied. The results show that the DS-type inclusions with sizes larger than 20 μm were CaO–Al2O3–SiO2–MgO–CaS composite inclusions. After Si–Al additions in vacuum degassing, typical inclusions were spinel or Al2O3. After Ca–Si additions during ladle treatment, typical inclusions were liquid or dual-phase Al2O3–CaO–SiO2–MgO. During the solidification process, due to the segregation of S and the decrease in solubility, the typical inclusions in the final casting became Al2O3–CaO–SiO2–MgO–CaS. For optimal fatigue performance of stainless steel castings, slag and refractory composition control were also necessary because the [Mg] contents mainly come from the slag and lining.

EMPIRE ISO-40

Alloy Digest ◽  
1972 ◽  
Vol 21 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion Cracking ◽  
Heat Treating ◽  
Temperature Performance ◽  
Erosion Corrosion ◽  
Steel Castings

Abstract EMPIRE IS0-40 is a precipitation-hardenable stainless steel for castings resistant to corrosion, stress-corrosion cracking and erosion-corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-278. Producer or source: Empire Steel Castings Inc..

The effects of morphology of ferrite and non-metallic inclusions on corrosion behaviour of as-cast 304 stainless steel

CORROSION ◽  
10.5006/3763 ◽  
2021 ◽  
Author(s):  
Danbin Jia ◽  
Liangcai Zhong ◽  
Jingkun Yu ◽  
Zhaoyang Liu ◽  
Yuting Zhou ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Solidification Process ◽  
Inclusion Size ◽  
304 Stainless Steel ◽  
Experimental Conditions ◽  
Quenching Temperature ◽  
Δ Ferrite ◽  
Metallic Inclusions

The effects of morphology of ferrite and non-metallic inclusions on corrosion resistance of as-cast 304 stainless steel (304 SS) were investigated. With the decrease in quenching temperature from 1723 K to 1648 K, the different microstructures of the as-cast 304 SS were obtained as the following series: austenitic-lathy δ ferrite, austenitic-colony δ ferrite and austenitic-blocky δ ferrite, and the average inclusion size increased. The electrochemical results show that the sample with the microstructure of austenitic- lathy δ ferrite and smaller size inclusions had a higher corrosion tendency and the lower pitting resistance. Furthermore, the effect of morphology and content of ferrite on corrosion resistance was greater than that of inclusion size under the current experimental conditions. Therefore, a promising method was developed to improve the corrosion resistance of as-cast 304 SS by changing the solidification process.

scholarly journals Definition of range of open applications for massive nodes in the stainless steel castings

2018 ◽  
Vol 0 (16(1292)) ◽  
pp. 90-95
Author(s):  
Andriy Shamrai ◽  
Dmytro Marynenko ◽  
Kateryna Kostyk ◽  
Nataliia Kravtsova
Keyword(s):  
Stainless Steel ◽  
Steel Castings ◽  
Definition Of

Persistent Ferrite in 18/8 Stainless Steel Castings

1992 ◽  
Vol 83 (12) ◽  
pp. 862-865
Author(s):  
Hans H. Stadelmaier ◽  
Ingeborg K. Simonsen ◽  
Candace L. Carnegie ◽  
Ronald L. Jones ◽  
Henry E. Lippard ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Steel Castings

scholarly journals Numerical Simulation of Temperature and Fluid Fields in Solidification Process of Ferritic Stainless Steel under Vibration Conditions

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 174
Author(s):  
Wenli Wang ◽  
Jing Chen ◽  
Miaomiao Li ◽  
Along Wang ◽  
Mengyao Su
Keyword(s):  
Stainless Steel ◽  
Temperature Field ◽  
Flow Field ◽  
Ferritic Stainless Steel ◽  
Stokes Equations ◽  
Solidification Process ◽  
Crystal Formation ◽  
Positive Temperature ◽  
Vibration Direction ◽  
Casting Mold

A three-dimensional model of a circular casting mold with a vibrating nucleus generator was established, and the characteristics of temperature and flow fields during the solidification process of ferritic stainless steel Cr17 in the casting mold were analyzed using finite element and finite difference methods. A standard k-ε turbulent current model was adopted to simulate the temperature field, and a standard k-ε model in Reynolds-averaged Navier–Stokes equations (RANS) was employed to deal with the flow field. The temperature field diffuses outward with a positive temperature gradient. Low degrees of undercooling can prevent solidified shells from forming rapidly on the surface of the nucleus generator. The temperature perpendicular to the direction of vibration is lower than that in the direction of vibration. The flow field exhibits a heart-shaped distribution and spreads gradually outward. The uniform distribution of grains can be achieved at three different frequencies of vibration. The results show that the degree of undercooling affects the distribution of the temperature field while the frequency of vibration affects the flow field significantly. Under the conditions of undercooling of 540 K and vibration frequency of 1000 Hz, the region perpendicular to the vibration direction of the nucleus generator is the optimum area for equiaxed crystal formation.

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