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This high temperature relative to normal quenching heating temperature, then can get the lath martensite, or increase the amount of lath martensite, so as to obtain good comprehensive properties.
Certificate from the carbon content of austenite and martensite morphology between steel quenching experiments, the carbon content of less than 0.3% of the total for the lath martensite. However, the common low carbon steel hardenability range, to obtain Martensitic, in addition to improve the stability of austenite alloy cold outside, only to improve and strengthen the austenitizing temperature quenching cooling can. For example, manufacturing five furrow plough arm for 16Mn steel, by quenching and low tempering temperature of 940 DEG C Ju in the aqueous solution of 10%NaOH, can obtain good effect.
Medium carbon steel by high temperature quenching the austenite composition uniformity: obtain analysis of lath martensite more, in order to improve the comprehensive performance. For example, AISl4340 steel, the temperature of 870 DEG C after oil quenching, tempering at 200 degree, the sigma S is 1621MN/m2, the fracture toughness of Kc 67.6MN/m, and heated at 1200 DEG C, 200 c tempering pre cooling to 870 DEG C after quenching oil, the sigma S is 1586MN/m2, the fracture toughness of Kc 81.8MN/m. If in the quenched state are compared, the fracture toughness of high temperature quenching doubled almost higher than that of ordinary quenching. Metallographic analyses show that high temperature quenching to avoid lamellar martensite (twin martensite) appear, all have a lath martensite. In addition, the martensite lath wrapped in a thick layer of 100-200 friends of residual austenite, can on the crack tip stress concentration play a buffer role, thereby enhancing the fracture toughness.