摘要
1 引言调质的42CrMo 钢钻铤,在生产与使用过程中性能不稳定。显微组织分析表明,调质处理后组织中有大量白块组织,为了认识白块组织的形成,实测了石油钻铤钢淬火时的连续冷却曲线,为进一步研究石油钻铤钢的组织和性能,确保石油钻铤的质量,提供一些基础性资料。2 试验材料及试验方法2.1 试验用钢及试验钻铤制备试验用钢的主要化学成分(wt%)如下;C 0.48,Si 0.29,Mn 0.67,Mo 0.20,Cr 1.06。试验钻铤是精锻毛坯料,其上钻有放置热电偶的(?)5.5mm 小孔,试验钻铤的尺寸、小孔的位置(测量点)。
In this paper,the continuous cooling transformation curves of 42Cr
Me,a kind of drill collar steels,were determined under practical conditions
and the reasons why there is white-lump structure in it after quench harden-
ing and tempering were discussed.The results showed that the structures
of 42CrMo after quench hardening are martensite and bainite.Under quench
hardering and tempering treatment,the white-lump structure in the steel is a
mixture of lower bainite and upper bainite.The main reasons for the occur-
rence of the white-lump structure are that the cooling rate is not quick enough
during quenching and there is banded structure in the primary structure of
this steel.
关键词
42CRMO钢
冷却曲线
显微组织
淬火
quench
drill collar
quench hardening and tempering treatment
bainite
