The dislocation density is low in the nugget zone.
焊核区晶内有少量位错。
EM observations indicate that the dislocation density is very low in the ELO reg ion.
透射电子显微镜的观测表明在ELO范围内位错密度很低。
The experimental results showed that the dislocation density increased with the cumulative reduction increased.
结果表明：随着轧制过程的进行，累积变形量的增加，位错密度逐渐提高。
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