| Abstract |
| Microstructural evolutions attributed to the change of Cr (or Mo) content and the heat treatment procedure have been studied to optimize the mechanical properties for pressure vessel applications. The relationship between microstructures and mechanical properties of Cr-Mo steels is established through laboratory scale experiments using 35 kg ingots that were hot-rolled and heat treated in various conditions. As the Cr or Mo content increased, the average grain size of ferrite decreased, while the volume fraction of pearlite increased, which resulted in the increase of tensile strength of the specimen. The experimental results were expected with continuous cooling curves calculated by a commercial program (JMatPro). Temper embrittlement after heat treatment occurred in high Cr (or Mo) steels. |
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| Key Words |
| alloys, tempering, microstructure, tensile test, CCT |
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