Abstract
The article investigated the effects of solution and ging temperatures on microstructure and mechanical properties of ultra-high strength stainless steel 10Cr13Co13Mo5Ni3W1VE(S280). Higher solution temperatures can improve impact toughness because of the quantity reduction of submicron-sized particles which act as microporous nucleation sites. S280 has the best mechanical properties at 1080 °C solution temperature. After quenching, the steel is completely martensite with almost no retained austenite. Aging at 560 °C results in peak strength due to the precipitation of fine carbides coherent zones. The loss of precipitates/matrix coherency and precipitates coarsening cause a decrease in strength at higher aging temperatures. Good strength and toughness obtained at 540 °C aging temperature are attributed to fine and dispersed strengthening phases such as Cr2C and Fe2Mo, and the recovery of austenite in high-density dislocation martensite matrix. The details of electron microscopy research, strengthening and toughening mechanisms are discussed.
Highlights
With the development of the aviation industry, the demand for high strength and toughness structural steels has promoted the progress of ultra-high strength stainless steel.The steels are designed for main load-bearing components of aircraft, such as landing gear and gas turbine engine shaft requiring high strength, high fracture toughness, and specific resistance to stress corrosion cracking and fatigue [1].The high strength steels currently using for landing gear are traditional ultra-high strength steels, such as 4340, D6AC, 300M, GC-4, 35NCD16, 30CrMnSiNi2 A [2,3,4,5,6,7,8] andAerMet100 [9]
While the samples for aging treatment, the billets were austenitized at 1080 ◦ C for 1 h, oil quenched to room temperature, and immediately transferred to a cryogenic bath maintained at −73 ◦ C
Most of the samples were examined by optical microscopy (OM)
Summary
With the development of the aviation industry, the demand for high strength and toughness structural steels has promoted the progress of ultra-high strength stainless steel.The steels are designed for main load-bearing components of aircraft, such as landing gear and gas turbine engine shaft requiring high strength, high fracture toughness, and specific resistance to stress corrosion cracking and fatigue [1].The high strength steels currently using for landing gear are traditional ultra-high strength steels, such as 4340, D6AC, 300M, GC-4, 35NCD16, 30CrMnSiNi2 A [2,3,4,5,6,7,8] andAerMet100 [9]. With the development of the aviation industry, the demand for high strength and toughness structural steels has promoted the progress of ultra-high strength stainless steel. The steels are designed for main load-bearing components of aircraft, such as landing gear and gas turbine engine shaft requiring high strength, high fracture toughness, and specific resistance to stress corrosion cracking and fatigue [1]. The high strength steels currently using for landing gear are traditional ultra-high strength steels, such as 4340, D6AC, 300M, GC-4, 35NCD16, 30CrMnSiNi2 A [2,3,4,5,6,7,8] and. Components design, double vacuum melting, forging billet lumber and other key processes and technology of ultrahigh strength stainless steel are developing [17,18]
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