【摘要】 用H-800型透射电子显微镜观察45号钢φ值不合格的拉伸试样,并对断口中亮斑、亮点区域分别进行了宏观和微观观察。试验结果表明:断口的亮斑、亮点区域是准解理的脆性断裂,是钢中氢含量过高所致,断口的纤维区是正常的韧性断裂,韧窝内有颗粒硫化物。更多还原

【Abstract】 This text has studied the tensile sample of 45 steel ψ value on the low side and to the bright spot in the fracture with H - 800 transmission electron microscope. Light spot area and fibre area carry on macroscopic and microscopic watch result of the test ruptures to be in steel hydrogen content too high to send to.The fibre district of the fracture is the normal toughness to rupture.There are forms sulphide of small and roundish thing in the tough更多还原