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KMID : 1157520170130040197
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International Journal of Clinical Preventive Dentistry
2017 Volume.13 No. 4 p.197 ~ p.202
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Effects of Heat Treatment on Mechanical Properties of Stainless Steel Wire
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Lee Gyu-Sun
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Abstract
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Objective: The purpose of this study is to investigate the heat treatment conditions to minimize the change of mechanical properties before and after the heat treatment of orthodontic stainless steel round wire with the length of 250 mm diameter of 0.9 mm.
Methods: 250 mm long straight tensile test specimens and 30 mm straight bend test specimens were fabricated in stainless steel wire with a diameter of 0.9 mm to meet the respective test conditions. The specimens were annealed at 300°C, 500°C, 700°C and 900°C without heat treatment and mooring at 20°C per minute. specimens before and after heat treatment were subjected to a tensile test and a bend test using a universal testing machine.
Results: Analysis of tensile properties proceeded on-way ANOVA. As a result of, there was a significant difference in yield load, yield strength, maximum load tensile strength. There was no significant difference in fracture displacement at 900°C. Analysis of the bending properties was carried out on-way ANOVA. As a result of, the maximum load was 300°C, 500°C and 900°C, and the tensile strengths were significantly different at 500°C and 700°C. There is no significant difference in maximum displacement
Conclusion: In the tensile test fracture displacement was higher when the heat treatment is performed at 300°C than that of the A company specific heat treatment, B, C for the company but the specific heat treatment was higher than 300°C from 500°C heating temperature goes up higher rupture displacement.
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KEYWORD
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tensile strength, yield strength, fracture displacement
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