冲击变质，小行星或彗星超速篷击行早表面，冲击波引起靶介质出现气化、熔融、热分解、粉碎、碎及岩石和矿物的各种特有的机械变形结构、多型体和相变等冲击效应。
对地表陨石坑岩石和陨石的冲击变质效应的研究， 是以往发现天然高压矿物的主要途径。
The study of shock-metamorphic effects on the rocks of terrestrial impact craters and on meteorites has been an approach in searching natural high-pressure minerals.
结果表明：稀土变质及热处理均能改善碳化物的形貌，提高其冲击韧度，且两者的综合作用效果更明显。
The results show that rare earth modification and heat treatment all can improve eutectic carbide morphology and increase the impact toughness, and both comprehensive result is more noticeable.
变质后高碳高速钢辊环在硬度不变的情况下，冲击韧性提高了73.6 %。
Compared with the high carbon high speed steel without modification treatment, the impact toughness is increased by 73.6 %, with same hardness.
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