You've got some spare 1050 steel that you decide to use to make a hand tool using your friend's forge. You've pulled the T-T-T diagram below from literature. (F, P, B, M represent ferrite, pearlite, bainite, and martensite respectively, where subscript "s" indicates the start of a transformation and subscript “f”” indicates the finish): a) What is the nominal carbon content in the steel? b) What temperature must be reached to completely austenitize the material? c) What is the proeutectoid phase? d) If you cool to 625°C and hold for 1000s, how much proeutectoid phase would be present (ignoring any impurities other than carbon)? e) Cutting tools are often hardened via rapid quenching, then tempered to give the desired balance of hardness and toughness. Sketch and describe the resulting microstructure (include labels for all the microconstituents), and illustrate the heat treatment on the T-T-T diagram. Temperature (°C) 900 800 A3 700 A₁ 600 500 400 M₁ 300 M 200 100 Y 0 0.1 F₁ B₁ 1 1 P₁ y+ a + pearlite y+bainite B₁ Y + martensite Martensite +y 10 a + pearlite Bainite 10² 10³ 104 Time (s) TTT curve for carbon steel AISI 1050 105 23 30 39 49 62 106 Rockwell C hardness

You've got some spare 1050 steel that you decide to use to make a hand tool using your friend's forge. You've pulled the T-T-T diagram below from literature. (F, P, B, M represent ferrite, pearlite, bainite, and martensite respectively, where subscript "s" indicates the start of a transformation and subscript “f”” indicates the finish): a) What is the nominal carbon content in the steel? b) What temperature must be reached to completely austenitize the material? c) What is the proeutectoid phase? d) If you cool to 625°C and hold for 1000s, how much proeutectoid phase would be present (ignoring any impurities other than carbon)? e) Cutting tools are often hardened via rapid quenching, then tempered to give the desired balance of hardness and toughness. Sketch and describe the resulting microstructure (include labels for all the microconstituents), and illustrate the heat treatment on the T-T-T diagram. Temperature (°C) 900 800 A3 700 A₁ 600 500 400 M₁ 300 M 200 100 Y 0 0.1 F₁ B₁ 1 1 P₁ y+ a + pearlite y+bainite B₁ Y + martensite Martensite +y 10 a + pearlite Bainite 10² 10³ 104 Time (s) TTT curve for carbon steel AISI 1050 105 23 30 39 49 62 106 Rockwell C hardness

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter27: Weldability Of Metals

Section: Chapter Questions

Problem 17R: Why must cracks in the martensite layer of high-manganese steels be removed?

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