论文部分内容阅读
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)、深
1 Introduction Quenched 42CrMo steel drill collar, instability in the production and use of performance. Microstructure analysis showed that there were a large number of white blocks in the quenched and tempered tissues. In order to know the formation of white blocks, the continuous cooling curve of oil drill collar quenched was measured. In order to further study the microstructure and properties of the oil drill collar steel, , To ensure the quality of oil drill collar, to provide some basic information. 2 Test materials and test methods 2.1 Test steel and test drill collar The main chemical composition (wt%) of the test steel is as follows; C 0.48, Si 0.29, Mn 0.67, Mo 0.20, Cr 1.06. Drill collars are precision forged blanks with a (Ø) 5.5 mm hole drilled for thermocouple testing, the size of the test collar, the location of the hole (measuring point), the depth