THE EFFECT OF SECONDARY HARDENING ON THE FRACTURE TOUGHNESS OF A BAINITIC MICROSTRUCTURE

1980 ◽  
pp. 217-226 ◽  
Author(s):  
H. Kotilainen
Keyword(s):  
Fracture Toughness ◽  
Secondary Hardening ◽  
Bainitic Microstructure

Effect of ordered domains on the fracture toughness of high Co-Ni secondary hardening steel

2017 ◽  
Vol 704 ◽  
pp. 32-37 ◽  
Author(s):  
Huiping Duan ◽  
Xiao Liu ◽  
Xianzhe Ran ◽  
Jia Li ◽  
Dong Liu
Keyword(s):  
Fracture Toughness ◽  
Secondary Hardening

2.47 GPa grade ultra-strong 15Co-12Ni secondary hardening steel with superior ductility and fracture toughness

2021 ◽  
Vol 66 ◽  
pp. 36-45
Author(s):  
Young-Kyun Kim ◽  
Kyu-Sik Kim ◽  
Young-Beum Song ◽  
Jung Hyo Park ◽  
Kee-Ahn Lee
Keyword(s):  
Fracture Toughness ◽  
Secondary Hardening

Analysis of fracture toughness in high Co–Ni secondary hardening steel using FEM

2015 ◽  
Vol 646 ◽  
pp. 1-7 ◽  
Author(s):  
Chenchong Wang ◽  
Chi Zhang ◽  
Zhigang Yang ◽  
Jie Su ◽  
Yuqing Weng
Keyword(s):  
Fracture Toughness ◽  
Secondary Hardening

Relationships between the Microstructure, Hardness and Fracture Toughness of Differently Sub-Zero Treated Tool Steel

2019 ◽  
Vol 395 ◽  
pp. 95-112 ◽  
Author(s):  
Peter Jurči ◽  
Ivo Dlouhý ◽  
Jakub Horník ◽  
Petra Priknerová ◽  
Zdeněk Mrštný
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Population Density ◽  
Tool Steel ◽  
Retained Austenite ◽  
Room Temperature ◽  
Secondary Hardening ◽  
Temperature Quenching ◽  
Treated Steel ◽  
Different Temperatures

A PM made Cr-V ledeburitic tool steel Vanadis 6 has been subjected to conventional austenitizing and quenching, which was followed by sub-zero treatment at different temperatures, and by tempering treatments. The microstructure, hardness and fracture toughness of sub-zero treated steel have been investigated with reference to the same material after conventional room temperature quenching. The main findings are that sub-zero treatments reduce the retained austenite amount, enhance the population density of small carbides, refine the martensite and change the precipitation of carbides during tempering. These alterations are reflected in elevated hardness after low-temperature tempering but slightly lowered hardness after tempering within the normal secondary hardening temperature range, except the specimens treated at-140 °C where the hardness improvement was maintained. The fracture toughness is rather negatively influence by the sub-zero treatments, except the treatment at-140 °C where no impact or rather improvement has been recorded; thus, the treatment at a temperature of-140 °C seems to be a promising way how to improve the hardness and the fracture toughness pf the Vanadis 6 steel simultaneously.

BR-4 DIE STEEL

Alloy Digest ◽  
1986 ◽  
Vol 35 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Heat Treating ◽  
Secondary Hardening ◽  
High Carbon ◽  
Steel Company ◽  
Die Steel ◽  
High Chromium

Abstract BR-4 is a high-carbon high-chromium die steel with unexcelled abrasive-resisting qualities. It has important secondary hardening properties. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-460. Producer or source: Latrobe Steel Company.

scholarly journals Mechanical Properties of Low-Temperature Bainite

2005 ◽  
Vol 500-501 ◽  
pp. 495-502 ◽  
Author(s):  
Carlos García-Mateo ◽  
Francisca García Caballero ◽  
Harshad K.D.H. Bhadeshia
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Retained Austenite ◽  
High Strength ◽  
Isothermal Transformation ◽  
Fine Scale ◽  
Bainitic Microstructure ◽  
Unusual Combination

The mechanical properties of a bainitic microstructure with slender ferrite plates (20-65 nm in thickness) in a matrix of carbon-enriched retained austenite were characterized. The microstructure is generated by isothermal transformation at temperatures in the range 200-300°C. A yield strength as high as 1.5 GPa and an ultimate tensile strength between 1.77 to 2.2 GPa was achieved, depending on the transformation temperature. Furthermore, the high strength is frequently accompanied by ductility (£ 30%) and respectable levels of fracture toughness (< 45 MPa m0.5). This unusual combination of properties is attributed to the exceptionally fine scale of the carbidefree bainitic microstructure and the associated retained austenite.

Precipitation in Al-Li-Zr alloys

1992 ◽  
Vol 50 (1) ◽  
pp. 186-187
Author(s):  
D.M. Vanderwalker
Keyword(s):  
Fracture Toughness ◽  
Precipitation Hardening ◽  
Weight Ratio ◽  
High Strength ◽  
Transmission Electron ◽  
Water Quench ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys ◽  
Zr Alloys

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

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