HIGH STRENGTH COMPONENT AND METHOD FOR MANUFACTURING THE SAME
To provide a high strength component excellent in static torsional strength and torsional fatigue strength.SOLUTION: A high strength component consisting of steel having a predetermined component composition includes a carburizing and quenching layer on a surface layer part and has 0.80 μm or less o...
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Zusammenfassung: | To provide a high strength component excellent in static torsional strength and torsional fatigue strength.SOLUTION: A high strength component consisting of steel having a predetermined component composition includes a carburizing and quenching layer on a surface layer part and has 0.80 μm or less of the arithmetic average roughness (Ra) of the surface, 1200-1650 MPa of a compressive residual stress and 490 HV or more of an equivalent hardness H defined by the following formula (1) on the basis of a hardness distribution from the surface to the inner center. H=Σ(Ki×Hi)/ΣKi .. the formula (1), where, Σ(Ki×Hi) is a value obtained by totaling the product of an area Ki (mm2) in a small region divided in the cross section of an object to be measured and a representative hardness Hi (HV) in the small region over the total small regions, and ΣKi is the area (mm2) of the total small regions.SELECTED DRAWING: None
【課題】静ねじり強度およびねじり疲労強度に優れた高強度部品を提供する。【解決手段】高強度部品は、所定の成分組成を有する鋼からなり、表層部に浸炭焼入れ層を有する。表面の算術平均粗さ(Ra)が0.80μm以下、圧縮残留応力が1200〜1650MPaで、更に、前記表面から内部中心までの硬さ分布に基づき下記式(1)で定義される相当硬さHが490HV以上である。H=Σ(Ki×Hi)/ΣKi・・式(1)、但し、Σ(Ki×Hi)は、測定対象の断面内にて区画された小領域の面積Ki(mm2)と該小領域の代表硬さHi(HV)の積を全小領域について合計したもの、ΣKiは、全小領域の面積(mm2)である。【選択図】 なし |
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