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Heat treatment process on the microstructure and properties of iron-based alloy forging state and its wear resistance

Author: XuJianQiu
Tutor: XiaoYuDe；LiuHuaShan
School: Central South University
Course: Materials Science
Keywords: Modification Forging deformation Heat treatment Pearlite Martensite Wear resistance
CLC: TG156
Type: Master's thesis
Year: 2010
Downloads: 160
Quote: 0
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Abstract


Melt by adding the composite modificators homemade smelting process modification, and metamorphic FeCr2.2C1.92M the alloy and FeCr8.5C2.37M alloy treated forging deformation test, then get the best amount of deformation the FeCr2.2C1.92M Alloy and FeCr8.5C2.37M alloy heat treatment process of exploration. Macro hardness testing, impact toughness testing and fracture scanning method, to study the mechanical properties of FeCr2.2C1.92M Alloys and FeCr8.5C2.37M of alloy of forging deformation and forging after optimum heat treatment. Metallurgical microscope, three-dimensional metallographic microscope, scanning electron microscopy, transmission electron microscopy microstructure observation and study of the microscopic mechanism FeCr2.2C1.92M the alloy and FeCr8.5C2.37M alloy, also a multi-functional micro-friction and wear tester with chrome steel ball sliding friction and wear. The results show that: (1) at the initial forging temperature of 980 ° C, respectively, under the conditions of 1050 ° C for the forging deformation, FeCr2.2C1.92M alloy and FeCr8.5C2.37M of alloys increases with the amount of thermal deformation, the hardness slightly decreased, The improved impact toughness. The optimal deformation amount of the final determine FeCr2.2C1.92M alloy should be 50%; FeCr8.5C2.37M alloy deformation amount should be 40%. (2) forging deformation the post FeCr2.2C1.92M Alloys and FeCr8.5C2.37M of alloy to develop the best heat treatment process system, FeCr2.2C1.92M alloy: 960 ℃ 6h annealing 880 ℃ 1h quenching 350 ℃ 1h tempering mechanical properties: hardness HRC57.3, impact toughness 26.3J · cm-2; FeCr8.5C2.37M alloy: 1000 ° C for 6h annealing 840 ℃ 1h quenching 450 ℃ 1h tempered mechanical properties: hardness HRC55.8 the impact toughness of 20.3J · cm-2. (3 and pearlite nuclear) FeCr8.5C2.37M alloy annealing process in growing up: cementite leading phase, and then the formation of ferrite, pearlite nuclei combined into a common, growing up as pearlite colonies. After quenching and tempering of FeCr2.2C1.92M Alloys and FeCr8.5C2.37M of alloy twinned martensite and martensite has a variety of forms. FeCr2.2C1.92M alloy: butterfly-shaped martensite, {259} γ-type martensite, {225} γ martensite; FeCr8.5C2.37M alloy: thin plate martensite, {259} γ Markov body {225} γ martensite, {3 15 10} γ-type martensite. (4) forging state, the best heat treatment state FeCr2.2C1.92M alloy samples, FeCr8.5C2.37M alloy samples were sliding wear tests with chrome steel (HRC62): For FeCr2.2C1.92M alloy, forging state The wear of the sample is greater than the optimum heat treatment state, and thus the optimum heat treatment state of the wear resistance of the sample is compared to forging a good state; For the forged state FeCr8.5C2.37M alloy forging state sample at a load of 20N, the wear greater than the optimum heat treatment state, and thus the wear resistance of the best heat treated samples than forging state. Load 40N-120N, the amount of wear of the forged state sample is less than the optimum heat treatment state, thus forging the wear resistance of the state of the sample at this time than the optimum heat treatment state is good.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process
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