230211 Materials option 40

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Uploaded: 08.03.2013
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Description

1. Spring Steel 65 after correctly performed quenching and subsequent tempering has a hardness much lower than that required for technical reasons. What caused this defect and how to fix it? Indicate which provides firmness and structure of the elastic properties of springs
2. For the production of hot stamping die steel 4H3VMF selected. Give and justify the regime of heat treatment, explaining the effect of doping on the transformations occurring during heat treatment of steel. Specify the microstructure and properties after the heat treatment of dies
3. For the production of selected parts of rolling bearings steel SHH15SG. Specify the composition of the steel, set mode of heat treatment and shows the properties of steel after heat treatment
4. Describe the refractory metals and their alloys. Give general characteristics of these alloys and specify the scope of their application
5. After the heat treatment of carbon steel structure is obtained: Cement + martensite tempering. Put on the phase diagram of the iron-cementite ordinate given steel (approximately) and select the heating temperature of the steel for quenching. Assign the tempering temperature, provides this structure and describe all the transformations that are committed in the steel during quenching and tempering

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