Influence of Semi-Solid Isothermal Heat Treatment on Microstructure and Mechanical Properties of Ductile Cast Iron

The effect of austenitizing temperature and aging treatment on the microstructure and mechanical properties of two new cold-rolled automotive steel plates (20Mn2Cr and 20Mn2CrNb) was investigated by using isothermal heat treatment, optical microscope, scanning electron microscope, microhardness tester, and tensile testing machine. The results show that as the austenitizing temperature increased, the original austenite grain sizes of both steels increased. The original austenite grain size of 20Mn2CrNb was smaller than that of 20Mn2Cr. The microhardness of 20Mn2CrNb gradually decreased with increasing aging temperature, while the hardness of 20Mn2Cr varied irregularly. The mechanical properties of 20Mn2Cr were better than those of 20Mn2CrNb under the same heat-treatment process. The effect of heat treatment on microstructure and mechanical properties was related to the martensite content, dislocation density, and precipitation of second-phase particles.

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Repair welding of ductile cast iron by laser cladding process: microstructure and mechanical properties

International Journal of Cast Metals Research ◽

10.1179/1743133614y.0000000126 ◽

2014 ◽

Vol 27 (6) ◽

pp. 378-383 ◽

Cited By ~ 8

Author(s):

C.-M. Lin ◽

A. S. Chandra ◽

L. Morales-Rivas ◽

S.-Y. Huang ◽

H.-C. Wu ◽

...

Keyword(s):

Mechanical Properties ◽

Cast Iron ◽

Laser Cladding ◽

Ductile Cast Iron ◽

Repair Welding ◽

Microstructure And Mechanical Properties ◽

Laser Cladding Process

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Effect of austempering parameters on microstructure and mechanical properties of heavy section Machinable Austempered Ductile Cast Iron (MADI)

Materials Research Express ◽

10.1088/2053-1591/ab0994 ◽

2019 ◽

Vol 6 (6) ◽

pp. 066522

Author(s):

Mohammad Ghoroghi ◽

Nasser Varahram

Keyword(s):

Mechanical Properties ◽

Cast Iron ◽

Ductile Cast Iron ◽

Heavy Section ◽

Microstructure And Mechanical Properties ◽

Austempered Ductile Cast Iron

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The Influence of Boron on Structure and Mechanical Properties of Bainite Ductile Iron in the Step Austempering in Room Temperature Machine Oil

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.235 ◽

2010 ◽

Vol 139-141 ◽

pp. 235-238

Author(s):

De Qiang Wei

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Cast Iron ◽

Impact Strength ◽

Ductile Iron ◽

Room Temperature ◽

Solute Drag ◽

Ductile Cast Iron ◽

Treatment Technique ◽

The Impact

In this paper, the low alloy bainite ductile cast iron has been obtained by a new heat treatment technique of the step austempering in room-temperature machine oil. The effects of element boron, manganese and copper on structure and mechanical properties of the bainite ductile cast Iron in above-mentioned process are investigated. The phenomenon, hardness lag of the alloyed bainite ductile cast Iron, has been discussed. It shows that after the step austempering in room-temperature machine oil, the hardness will increases with the time. It is found that boron and manganese can increase the hardness and reduce the impact strength while copper can increase the impact strength. The results show that reasonable alloyed elements can improve mechanical properties of the bainite ductile cast Iron. Essentially, hardness lag of the alloyed bainite ductile cast Iron is resulted from solute drag-like effect.

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Property and Application of Austempered Ductile Cast Iron

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.328-330.1297 ◽

2011 ◽

Vol 328-330 ◽

pp. 1297-1300

Author(s):

Guang Si Luo

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Cast Iron ◽

Treatment Process ◽

Nodular Cast Iron ◽

Ductile Cast Iron ◽

Heat Treatment Process ◽

Engineering Material ◽

High Fatigue ◽

Austempered Ductile Cast Iron

Austempered ductile cast iron is newly developed engineering material with a favorable combination of comprehensive mechanical properties. Its properties, such as good comprehensive mechanical properties, high fatigue strength, and good fiction and wear characteristics are included. The application of ADI at home and abroad was presented as well. In order to ensure and improve mechanical properties of ADI, it should ensure high rank nodularity in terms of nodular cast iron, improve graphite nodules, reduce segregation and properly cut down the content of silicon and manganese. While in terms of heat treatment, in order to achieve ideal austenite ferrites, stable and reliable heat treatment process as well as relevant equipment is required.

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