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"brief_description": "Hypoeutectoid steel, normalised at 1100°C",
"long_description": "A hypoeutectoid alloy (carbon composition less than eutectoid). The first phase formed upon cooling from the austenite phase field is proeutectoid ferrite. Due to the lower solubility of carbon in ferrite, carbon is partitioned into the remaining austenite. At the eutectoid point the remaining carbon enriched austenite transforms to pearlite (a mixture of ferrite and cementite) which is the darker region of the micrograph. The proportion of pearlite is dependent upon the overall composition. The ferrite (light areas) is a good example of an allotriomorphic ferrite. This means that its shape does not reflect its internal crystalline symmetry as it nucleates on the austenite grain boundaries and hence follows the shape of the boundaries, the remaining austenite within the ferrite then transforms to pearlite, and is surrounded by the ferrite. The large size of the areas of pearlite arises due to the high normalisation temperature which causes the austenite grains to grow large.",
"contributor": "Dr R F Cochrane",
"organisation": "Department of Materials, University of Leeds",
"last_updated": "2025-09-23T07:48:24.600929Z",
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{
"id": 43,
"name": "Microstructure 276",
"short_name": "microstructure276",
"data_type": 1,
"technique": 1,
"keyword": [
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7,
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66
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"element": [
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7,
15
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"brief_description": "Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C",
"long_description": "After initial casting of this steel it was subject to a process known as carburisation. The metal is heated to above the ferrite-austenite transition in a carbon atmosphere. This establishes a concentration gradient and hence carbon diffuses into the steel. Usually the steel is then hardened by quenching. This produces what is known as a case hardened steel - with a hard surface (case) surrounding a tough core. The carbon gradient can be seen in the changing shade of the sample from left to right, with high carbon concentration at the left (surface) and hence a martensitic phase, changing to the lighter shade consisting of mostly ferrite.",
"contributor": "Dr R F Cochrane",
"organisation": "Department of Materials, University of Leeds",
"last_updated": "2025-09-24T11:04:36.807027Z",
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