晶块，是不具有规则几何外形的大块结晶体，也就是说晶块是大个晶体的一部分。
随着降低回火温度，微观应变升高而晶块尺寸减小。
The microstrains increase and domain sizes decrease with the decrease in tempering temperatures.
该工艺不受人造聚晶金刚石外形及尺寸的限制，可对拉丝模中的人造金刚石聚晶块提供有效的紧固保护。
This technique is no longer restricted by the formal regularity of diamond polycrystal blank, and can give an effective tight protection to diamond polycrystal blank in wire-drawing die.
维氏硬度测试结果显示，出现在愈合区的铁素体组织维氏硬度高于基体区铁素体组织，可能原因是愈合区中出现的多边晶块结构所引发的强化。
Vickers hardness test showed that the hardness of ferrite in healing area is higher than that in matrix, which may result from the strengthening of polyangular grains.
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