热处理工艺对镍/L360钢硬度及显微组织的影响

Influence of different heat treatment methods on hardness values and microstructures of Ni-base/L360 steel bi-metal composite material

采用爆炸法得到镍与L360管线钢界面结合强固的双金属复合材料,并用维氏硬度计和光学显微镜等仪器,研究了用3种不同方法得到的试样中金属界面组织的结构特征和样品硬度的变化.结果表明:采用固溶水冷并回火工艺得到的试样硬度略低于母材,有利于后续冷挤压成型,且材料中镍基部分固溶强化作用明显,结合界面组织分布均匀,此工艺得到的镍基双金属材料加工性能和机械性能最佳;而采用固溶空冷工艺得到的试样硬度远低于母材,难以满足实际使用要求.

Abstract： The explosive cladding method is used to obtain strong-binding-force bi-metal composite material that consists of metal nickel and L360 pipeline steel. Three groups of samples under differ- ent heat treatment processes are compared, which include non-heat treated, tempering after solid solution and water cooling, solid solution and air cooling. The influence of different heat treatments on interface configurations and hardness values of bi-metal composite material is analyzed by observ- ing the changes of above parameters with Vivtorinox hardness tester and optical microscope. The result shows that tempering after solid solution and water cooling heat treatment is the best way to manufacture nickel-base bi-metal composite material with optimum processing properties and me- chanical properties though the hardness values of samples are slightly lower than those of base metal owing to that the obvious solid solution strengthening effects in metal nickel part and the uniform tissue distribution in interface part. However, hardness values of samples are not satisfied to the actual use requirements which are under solid solution and air cooling heat treatment.