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本文分析了轴承钢现有各种强韧化工艺,和细晶、细化碳化物、净化晶界强韧复相等强韧化工艺的优点,研究了几种新的复合热处理工艺、组织与性能。其中最佳的工艺在等硬度下可分别提高 GCr15钢性能(%);σ_(bb) 27;~aK 66;K_(IC) 72;f 100。这是由于在复合热处理中,消除了成分偏聚,细化组织(M,C),净化晶界,从而避免早期沿晶脆断,充分发挥各种强韧化因素作用,其中以基体组织细化和未溶碳化物细化强韧化起主导作用。
In this paper, the advantages and disadvantages of the various existing toughening processes and the toughening processes such as fine grain refinement of carbides and the purification of grain boundaries are analyzed. Several new composite heat treatment processes, microstructures and properties . Among them, the best technics can improve the performance of GCr15 steel (%) under equal hardness; σb (bb) 27; ~ aK 66; K_ (IC) 72; f 100. This is due to the compound heat treatment, the elimination of the composition of segregation, refinement of the organization (M, C), purification of grain boundaries, so as to avoid the early intergranular brittle fracture, give full play to a variety of toughening factors, including the matrix fine Carbonization and undissolved carbides play a leading role in refining and strengthening.