本文报道了用端淬法和热膨胀试验研究微量Ca对58CrV钢淬透性和CCT曲线的影响和用Auger能谱(AES)分析断口表面的Ca及其它合金元素含量的结果。表明,微量Ca明显提高钢的淬透性,在连续冷却时降低珠光体转变及贝氏体转变的临界冷却速度,提高Ms点Auger谱分析表明,Ca在奥氏体晶界有十分明显的晶界偏聚,并促进C、Cr、Si的晶界偏聚认为微量Ca除了脱氧去硫和改善硫化物形貌作用外,还有合金化的作用。
Effect of Ca on hardenability and CCT diagram of 58CrV steel has been inves-tigated by means of end-quenching and thermal expansion. An addition of 0.006 wt-%Ca tothe stpel may improve the hardenability, reduce the critical cooling rate of transformation ofpearlite or bainite under continuous cooling and increase the M_s. AES analysis showed thatthe Ca segregates markedly along austenitic gfain boundaries, and accelecrates the segrega-tion of C, Cr and Si. It is believed that besides towards deoxidizing and desulphurizing as wellas imperoveing sulphide morphology, a trace of Ca in 58CrV steel behaves towardsmicroalloying.
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