scholarly journals Microstructural Stability and Softening Resistance of a Novel Hot-Work Die Steel

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 238 ◽  
Author(s):  
Ningyu Du ◽  
Hongwei Liu ◽  
Paixian Fu ◽  
Hanghang Liu ◽  
Chen Sun ◽  
...  
Keyword(s):  
Dislocation Slip ◽  
Microstructural Stability ◽  
H13 Steel ◽  
Die Steel ◽  
Die Steels ◽  
Molybdenum Carbides ◽  
Transmission Electron ◽  
Service Period ◽  
Tempering Treatment ◽  
Hot Work Die

A novel hot-work die steel, named 5Cr5Mo2, was designed to obtain superior thermal stability. The proposed alloy is evaluated in terms of its hardness, microstructure, and tempering kinetics. Compared with the commonly used H13 steel, the softening resistance of the designed steel is superior. Based on SEM and transmission electron microscopy (TEM) observations, a higher abundance of fine molybdenum carbides precipitate in 5Cr5Mo2 steel. Strikingly, the coarseness rate of the carbides is also relatively low during the tempering treatment. Moreover, owing to their pinning effect on dislocation slip, the dislocation density of the 5Cr5Mo2 steel decreases more slowly than that of the H13 steel. Furthermore, a mathematical softening model was successfully deduced and verified by analyzing the tempering kinetics. This model can be used to predict the hardness evolution of the die steels during the service period at high temperature.

Strengthening Mechanism and Thermal Stability of Spray Formed H13 Steel

2019 ◽  
Vol 295 ◽  
pp. 49-56
Author(s):  
Zhan Zhan Zhang ◽  
Wan Zhen Wang ◽  
Yun Bo Chen ◽  
Miao Hui Wang ◽  
Chang De Zhao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Strengthening Mechanism ◽  
H13 Steel ◽  
Tempering Temperature ◽  
Transmission Electron ◽  
Tempering Treatment ◽  
Hardness Values ◽  
Thermal Stability Of

The aim of this work is to study the strengthening mechanism and thermal stability of spray formed H13 steel. The microstructure and hardness of spray formed H13 steels are investigated by electron microscopy, transmission electron microscopy and hardness measurementscanning. The calculated results demonstrate that tensile strength, impact energy and hardness values of sprayed-formed H13 steel are higher than that of as-cast H13 steel when the tempering temperature is 600 °C after quenched at 1050 °C. Compared with as-cast H13 steels, tempered spray-formed H13 steels possess supernal high-temperature temper resistant stability. The chemical composition of the carbides in spray-formed steels is V and Cr rich spherical carbides are hardly influenced by the tempering treatment.

scholarly journals Influence of Tempering Time on the Behavior of Large Carbides’ Coarsening in AISI H13 Steel

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1283
Author(s):  
Angang Ning ◽  
Stephen Yue ◽  
Rui Gao ◽  
Lingxia Li ◽  
Hanjie Guo
Keyword(s):  
Ostwald Ripening ◽  
Die Casting ◽  
H13 Steel ◽  
Iron And Steel ◽  
Die Steel ◽  
Aisi H13 Steel ◽  
Transmission Electron ◽  
Aisi H13 ◽  
Ripening Rate ◽  
Tempering Time

The mechanical properties, microstructures and precipitation behaviors in AISI (American Iron and Steel Institute) H13 steel tempered at 863 K for 0.5, 2, 4, 10 and 20 h were investigated. The values for H13 tempered for 2–4 h resulted in die steel that reached the desired properties as specified in NADCA (North American Die Casting Association) #207-2016. The cubic Ostwald ripening model was applied to simulate the coarsening of the large carbides, which were mainly M23C6 and M3C, as determined from FactSage predictions as well as measurements with transmission electron microscopy (TEM). TEM revealed that the equivalent circle radius (ECR) decreased during 0.5–2 h, because of the nucleation of many new precipitates. According to the Ashby-Orowan modified precipitation strengthening model, this decrease in ECR leads to an increase in the contribution of precipitates to yield strength. Between 2 and 4 h tempering, the ECR of large carbides increases sharply but then increases asymptotically from 4 to 20 h, which obeys the calculated Ostwald ripening rate for cementite and M23C6 in H13 after 863 K tempering. This observation for the Ostwald ripening of M23C6 is in agreement with experimental data for other steels in the literature.

Application of Si in Tool and Die Steel

2013 ◽  
Vol 676 ◽  
pp. 35-39
Author(s):  
Shi Hong Huang ◽  
Ting Lei ◽  
Hong Xiao Chi ◽  
Dang Shen Ma
Keyword(s):  
Tool Steel ◽  
High Speed ◽  
Cold Working ◽  
Reference Value ◽  
Die Steel ◽  
Die Steels ◽  
Different Types ◽  
Hot Work Die

This paper analyzed the application status of Si in high speed tool steel, cold working die steel, hot work die steel and plastic die steel. On this basis, the effect of Si on the properties of different types of tool and dies steels is summarized. There is the certain reference value of the application of Si in tool and die steels.

Research on Hot-Work Die Steel Used for Extrusion Wheel

2012 ◽  
Vol 482-484 ◽  
pp. 1611-1617
Author(s):  
Sheng Feng Wang ◽  
Hong Yu Liu ◽  
Peng Zhou
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Thermal Fatigue ◽  
Treatment Process ◽  
Fatigue Tests ◽  
Heat Treatment Process ◽  
Die Steel ◽  
Die Steels ◽  
Treatment Processes ◽  
Hot Work Die

A set of new nitrogen-containing hot work die steels were designed. The best experimental steels and their heat treatment processes were optimized by microstructures, mechanical properties and thermal fatigue tests. The results show that the best compositions of V, Cr, N are 1.0 wt％, 3.75 wt％ and 0.01 wt％, respectively. The optimized heat treatment process is that quenching at 1080°C, first tempering at 550°C and second tempering at 530°C.

Study on Carbide in Forged and Annealed H13 Hot Work Die Steel

2015 ◽  
Vol 34 (6) ◽  
Author(s):  
Ji Li ◽  
Jing Li ◽  
Liangliang Wang ◽  
Longfei Li
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Hot Forging ◽  
Quantitative Chemical Analysis ◽  
Analysis Method ◽  
X Ray Diffraction ◽  
H13 Steel ◽  
Die Steel ◽  
Thermo Calc Software ◽  
Hot Work Die ◽  
Primary Carbides

AbstractThe present work studied the carbides in forged and annealed H13 hot work die steel. The carbides were examined by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) and analyzed with quantitative chemical analysis method. The carbide types, qualities and compositions in dependence on temperatures were thermodynamically calculated by Thermo-Calc software and compared with the experimental results. In the final, methods for carbide improvement were discussed. The results are as follows. The primary carbides and the carbide segregation are improved after the hot-forging operation. The carbides in the hot-forged and annealed H13 steel are M

HOTFORM ULTRA

Alloy Digest ◽  
1985 ◽  
Vol 34 (5) ◽  
Keyword(s):  
Wear Resistance ◽  
Die Casting ◽  
Hot Extrusion ◽  
Heat Treating ◽  
Die Steel ◽  
Extrusion Dies ◽  
Die Steels ◽  
Aisi Type ◽  
Hot Work Die ◽  
Hot Hardness

Abstract HOTFORM ULTRA is a modified 5% chromium hot-work die steel originally developed by the manufacturer in the 1960's. It possesses hot hardness superior to that of AISI Type H11 and AISI Type H13, and approaches the hot hardness of the tungsten-based hot-work die steels. Typical applications for Hotform Ultra include die-casting dies, core pins and inserts, piercing dies and hot-extrusion dies. This datasheet provides information on composition and physical properties. It also includes information on wear resistance as well as forming, heat treating, machining, and joining. Filing Code: TS-440. Producer or source: Teledyne Vasco.

Improved mechanical properties by nanosize tungsten-molybdenum carbides in tungsten containing hot work die steels

2021 ◽  
Vol 812 ◽  
pp. 141140
Author(s):  
Riming Wu ◽  
Wei Li ◽  
Meng Chen ◽  
Shan Huang ◽  
Tao Hu
Keyword(s):  
Mechanical Properties ◽  
Die Steels ◽  
Molybdenum Carbides ◽  
Hot Work Die

AL TECH D-5

Alloy Digest ◽  
1980 ◽  
Vol 29 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Abrasion Resistance ◽  
Heat Treating ◽  
High Carbon ◽  
Die Steel ◽  
High Chromium ◽  
Die Steels ◽  
Edge Strength ◽  
Specialty Steel

Abstract AL Tech D-5 is a high-carbon, high-chromium tool and die steel; it contains cobalt (3.30%) and is air-hardening and nondeforming. The cobalt impacts a pronounced secondary hardening effect in tempering and a non-galling effect. AL Tech D-5 has both superior abrasion resistance and greater edge strength than ordinary high-carbon, high-chromium die steels. It is used for many types of dies, hot-piercing punches and shear blades. This datasheet provides information on composition, physical properties, and hardness as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-372. Producer or source: AL Tech Specialty Steel Corporation.

CARPENTER 883 PLUS

Alloy Digest ◽  
1994 ◽  
Vol 43 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Structural Integrity ◽  
Heat Treating ◽  
Die Steel ◽  
Aisi Type ◽  
Red Hardness ◽  
Hot Work Die

Abstract CARPENTER 883 PLUS is a 5% Chromium hot work die steel designed for applications requiring both toughness and good red-hardness. It achieves this with higher purity, homogeneity and greater structural integrity than standard AISI type H13. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-529. Producer or source: Carpenter. See also Alloy Digest TS-469, January 1987.

PYROTOUGH 78

Alloy Digest ◽  
1993 ◽  
Vol 42 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Good Combination ◽  
Die Steel ◽  
Hot Work Die ◽  
Microstructural Integrity ◽  
High Degree

Abstract PYROTOUGH 78 is a hot work die steel possessing a high degree of purity, homogeneity and microstructural integrity that produces a good combination of toughness and temper resistance. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating and machining. Filing Code: TS-522. Producer or source: Carpenter.

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