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twinned substructure in lath martensite of water quenched Fe-0.2%C and Fe-0.8%C steels

Journal of Materials Science & Technology 2020年第14期47卷 126-132页

作者： Haidong Sun Yuhui Wang Zuohua Wang Ning Liu Yan Peng Xiujuan Zhao Ruiming Ren Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao066004China Liren College of Yanshan University Yanshan UniversityQinhuangdao066004China School of Materials Science&Engineering Dalian Jiaotong UniversityDalian116028China

In the present investigation,twinned substructures within lath martensite of two water quenched steels(0.2 wt.%C and 0.8 wt.%C)were *** lath martensite has typical hierarchical packet-block-lath with dislocation ***,laths that are misoriented by/70.5°or/60° and bordered by{011}plane,namely twinned laths,are observed,of which the density increases and the scale decreases as more carbons were *** twinned laths have body centered cubic(bcc)crystal structure,belonging to twinned variants following the classical Kurdjumov-Sachs(K-S)orientation relationship with respect to the parent *** bcc{112}twins,twinned variants produce strong double diffraction and in turn the extra diffraction spots that are commonly observed in the martensite in steels with wide range of carbon contents.

关键词： twinned variant Lath martensite Double electron diffraction Orientation relationship Steels

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twinned Martensitic Substructure in a Water Quenched Fe–1.0 wt%C Alloy

引用

Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1157-1163页

作者： Haidong Sun Zuohua Wang Shuai Zhang Ning Liu Pinwen Zhu Dongli Yu Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

A Fe–1.0 wt%C alloy was quenched into water from 1100 ℃,leading to lath martensite and plate martensite of body-centered tetragonal *** these two martensites have the twinned substructure that generates mirror symmetric diff raction patterns with extra diff raction spots around n/3(112).The twinned substructure has the origin from twinned martensitic variants,namely twin-related crystals separated by{110},rather than{112}deformation *** eff ect on the electron double diff raction of twinned variants was discussed.

关键词： twinned martensitic substructure twinned variant Lath martensite Plate martensite

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