【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20190728
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Question: What structural changes occur in heat-resistant steel at high temperatures? There are no answers provided for this series of posts; fellow netizens are free to share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! Chemical Equipment and Machinery
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments for extended periods.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments for extended periods.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments over a long period of time
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments for extended periods.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments for extended periods.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments for extended periods.
Spheroidization of carbides. Graphitization. Depletion of alloying elements in the solid solution.
1. Spheroidization of carbides. At high temperatures, the carbides in pearlite change from flake-shaped to spherical; after this transformation, the creep strength of the steel decreases. 2. Graphitization. Under high temperatures, the cementite in the structure of heat-resistant steel tends to decompose into iron and graphite. 3. Depletion of alloying elements in the solid solution. At high temperatures, the atomic diffusion capacity of heat-resistant steels increases, leading to a redistribution between the solid solutions of alloying elements and the carbides. Creep also occurs as a result of operating in high-temperature environments for extended periods.