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低合金钢淬火成马氏体后,在一定温度范围回火时,往往出现冲击韧性下降或断口特征韧-脆转折温度上升,这种现象,称为回火脆。回火脆一般又可分为两类:第一类回火脆是指淬火马氏体在约250～450℃间回火时产生的。这时钢的组织为回火马氏体,所以又常称为回火马氏体脆性。第二类回火脆是当钢经过600℃以上回火,其马氏体组
Low-alloy steel quenched into martensite, tempering at a certain temperature range, the impact toughness often appears to decline or fracture toughness - brittle transition temperature rise, this phenomenon is called temper brittleness. Temper can generally be divided into two categories: The first type temper brittle quenching refers to the quenching martensite at about 250 ~ 450 ℃ tempering generated. At this time the organization of the steel tempered martensite, so often referred to as tempered martensite brittleness. The second type of temper brittleness is when the steel after tempering over 600 ℃, the martensite group