The fracture rod has cracks in the microstructure of weld zone, intergranular cracks exists in the coarsegrainzone of the weld heat affected zone.
进一步比较了断裂拉杆和已经产生裂纹的拉杆焊缝区的显微组织，发现在焊缝的热影响区粗晶区存在沿晶裂纹。
2
Microstructure of simulated coarsegrain heat affected zone (CGHAZ) of Zr Microalloyed HSLA Steel are investigated using optical microscopy and transmission electron microscopy.
采用光学显微镜和透射电镜研究了锆处理对微合金钢粗晶热影响区组织的影响。
3
Owing to heat action during X80 pipeline steel welding the organization and performance of heat affected zone will change considerably in particular of coarsegrain heat affected zone (CGHAZ).