摘要:
High strength steel sheet which secures tensile maximum strength 900 MPa or more high strength while having excellent shapeability, which high strength steel sheet which is excellent in shapeability characterized by having a predetermined composition of ingredients, by the steel sheet structure including a ferrite phase and martensite phase, by the ratio of Cu particles incoherent with the bcc iron being 15% or more with respect to the Cu particles as a whole, by a density of Cu particles in the ferrite phase being 1.0×10 18 /m 3 or more, and by an average particle size of Cu particles in the ferrite phase being 2.0 nm or more.
摘要:
Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.
摘要:
This impact-absorbing member includes a tubular body having a polygonal shape in cross section perpendicular to a longitudinal direction of the tubular body, the tubular body including: a plurality of flat portions; and a plurality of corner portions provided between the flat portions, in which a thermal treatment with a laser light is applied at least to a first field of the tubular body located in a distance X that satisfies Expression (1) below, where L is an average side length of all sides constituting the polygonal shape at an end portion in the longitudinal direction of the tubular body, the X is a distance in the longitudinal direction from the end portion of the tubular body, and a is an integer with a value of one or more. a - 1 / 2 �¢ L ‰¤ X ‰¤ aL
摘要翻译:该冲击吸收构件包括与管状体的纵向垂直的截面为多边形的管状体,所述管状体包括:多个平坦部分; 以及设置在所述平坦部之间的多个角部,其中利用激光进行热处理至少施加在位于距离X的管状体的第一场,所述距离X满足下面的表达式(1),其中L是 在管状体的长度方向的端部,构成多边形的所有面的平均侧面长度为X,与管状体的长度方向的距离为长度方向,a为值,为 一个或多个。 a - 1/2 ¢L‰X‰¤aL
摘要:
The present invention provides a high-strength steel sheet excellent in shape fixability. The high-strength steel sheet contains C, Si, Mn, P, S, Al, N, and O with predetermined contents, in which a retained austenite phase of 5 to 20% in volume fraction is contained, an amount of solid-solution C contained in the retained austenite phase is 0.80 to 1.00% in mass%, W Si³ is 1.10 times or more W Si* , W Mn³ is 1.10 times or more W Mn* , and when a frequency distribution is measured with respect to a sum of a ratio between W Si and W Si* and a ratio between W Al and W Al* , a mode value of the frequency distribution is 1.95 to 2.05, and a kurtosis is 2.00 or more.
摘要:
A laser welded joint has weld metal provided between a plurality of steel sheets. A chemical composition of the weld metal has predetermined components, and average hardness of the weld metal is 350 to 540 in Vickers hardness. In the weld metal, distribution density of porosities having a diameter of 2 µm to 50 µm is equal to or less than 5.0 pieces/mm 2 . In the weld metal, distribution density of oxide inclusions having a diameter of 3 µm or more is 0.1 to 8.0 pieces/mm 2 .
摘要:
The present invention provides a press forming simulation method using a finite element method for a sheet metal, in which a deformation state of a pressing tool is represented with high accuracy by superimposing at least one natural mode, for the surface shape of the pressing tool, in a no-load state.