Nellori dileep kumar - Academia.edu (original) (raw)
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Case Western Reserve University
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The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizi... more The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizing cycles of 1050◦C, 1075◦C and 1100◦C followed by subzero treatment at -70◦C. The fraction of retained austenite has been reduced after sub-zero treatment as revealed by microstructural evolution. The material was subsequently tempered at different temperatures ranging from 180◦C to 650◦C and the change in micro-structure, hardness, tensile strength and toughness were investigated after each heat treatment cycle. Optical microscopy, electron microscopy with EDS and X-Ray diffraction techniques were used to characterize the material. This has showed the constituents of microstructure were lath martensite, precipitated metal carbides of type M23C6, M7C6 and carbo-nitrides. Hardness, tensile testing and Charpy impact testing were carried to evaluate mechanical properties after the heat treatment which has showed the better mechanical properties for the samples solutionised at 1075◦C. Secon...
The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizi... more The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizing cycles of 1050 • C, 1075 • C and 1100 • C followed by subzero treatment at-70 • C. The fraction of retained austenite has been reduced after sub-zero treatment as revealed by microstructural evolution. The material was subsequently tempered at different temperatures ranging from 180 • C to 650 • C and the change in micro-structure, hardness, tensile strength and toughness were investigated after each heat treatment cycle. Optical microscopy, electron microscopy with EDS and X-Ray diffraction techniques
The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizi... more The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizing cycles of 1050◦C, 1075◦C and 1100◦C followed by subzero treatment at -70◦C. The fraction of retained austenite has been reduced after sub-zero treatment as revealed by microstructural evolution. The material was subsequently tempered at different temperatures ranging from 180◦C to 650◦C and the change in micro-structure, hardness, tensile strength and toughness were investigated after each heat treatment cycle. Optical microscopy, electron microscopy with EDS and X-Ray diffraction techniques were used to characterize the material. This has showed the constituents of microstructure were lath martensite, precipitated metal carbides of type M23C6, M7C6 and carbo-nitrides. Hardness, tensile testing and Charpy impact testing were carried to evaluate mechanical properties after the heat treatment which has showed the better mechanical properties for the samples solutionised at 1075◦C. Secon...
The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizi... more The High Nitrogen Martensitic Stainless Steel (HNMS) was subjected to three different austenitizing cycles of 1050 • C, 1075 • C and 1100 • C followed by subzero treatment at-70 • C. The fraction of retained austenite has been reduced after sub-zero treatment as revealed by microstructural evolution. The material was subsequently tempered at different temperatures ranging from 180 • C to 650 • C and the change in micro-structure, hardness, tensile strength and toughness were investigated after each heat treatment cycle. Optical microscopy, electron microscopy with EDS and X-Ray diffraction techniques