冲击值
1.434 we shall take the sample to test its physical properties (mechanical properties, tensile strength, yield point, percentage elongation, reduction of area, impact value, brinell hardness).
2.Adopting sectional accelerated speed liner increase achieve inflexion smooth transition of saw liner accelerated speed,to reduce impact value.
3.After heat treating (0.75%C) , u~= 1265MPa, 6514.5%, ak(20?C)=16.72J/cm2, the pearlite interlamellar spacing is to 0.09965pm, the 9?
4.1. The mechanical property were achieved with as roll CrNb (0.75%C) rail steel: Gb-l O65MPa, 6~=1 0.5%, ak(20C) =1 3.3J/cm2,K1c(-20 t)33.OMPam? , the pearlite interlamellar spacing is to 0.1895pm, seven grade size of austenite grain is determined.
5.This research revises the current theory of fragility and makes cushioning design for product more precise and more actual.
6.Result The data of impact acceleration of return-cabins of "SZ-3"and "SZ-4" were accurately recorded during landing. Most reliable and scientific data were gotten.
8.The results show that the hardness and impact toughness of the alloy ZG30SiMnCr austempered at 300 ℃ for 60 min reach 47.13 HRC and 134.70 J/cm2,respectively. The alloy has an excellent comprehensive mechanical property. It has typical dual-phases austenitic-bainitic structure without carbides.
9.The stress factor for the ladle turret or ladle support when pot is being received are described. From the view points of energy exchange, the theoretical calculation formula for the impact coefficient of ladle turret cantilever when pot is being received it also deduces and the affecting factor of the impact coefficient kd value. In addition is analyzes, example for checking the impact factor of Demag ladle turret is gived.
10.The effects of quenching temper ature, aging temperature and time on microstrain △a/a have been investigated by means of X-ray diffraction. As shown in the electron transmission micro graph the reverted austenite disperses along ihebound aries of martensite, thus improving the impact toughness ak.
