高压热处理诱导工业纯铁马氏体相变  

High-pressure heat treatment induced martensitic transformation of industrial pure iron

作　　者：陈鑫 崔晴 程子健 徐畅 温斌[3] 林小娉 CHEN Xin;CUI Qing;CHENG Zi-jian;XU Chang;WEN Bin;LIN Xiao-ping(School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]东北大学秦皇岛分校资源与材料学院,河北秦皇岛066004 [2]东北大学材料科学与工程学院,辽宁沈阳110819 [3]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《钢铁》2021年第10期127-135,共9页Iron and Steel

基　　金：国家自然科学基金资助项目(51675092);国家杰出青年科学基金资助项目(51925105)。

摘　　要：为了研究高压下马氏体组织形态特征及高压淬火马氏体相变机制,利用CS-1V型六面顶高压设备、在3、4和5GPa高压下对工业纯铁进行热处理,利用SEM、EBSD等分析手段研究了高压淬火对工业纯铁马氏体组织形态及力学性能的影响。结果表明,GPa级高压下奥氏体化后,工业纯铁以6℃/s冷却速率就能淬火获得马氏体。3GPa下,工业纯铁淬火马氏体呈现典型的低碳马氏体组织形貌;4GPa下,其板条马氏体形成过程与典型的片状马氏体类似,先形成的板条束贯穿整个奥氏体晶粒并将其分割,后形成的板条束尺寸大小受限;5GPa下,以协作方式通过母相转变为马氏体的"协作方阵"数量多、尺寸小、整齐性高,并多呈"梯形"生长。5GPa下淬火工业纯铁的力学性能接近常压下淬火的0.2%C钢水平,硬度达415HV,屈服强度达700MPa。In order to study the microstructure and transformation mechanism of martensite under high pressure quenching,the effect of high-pressure quenching on martensite structures and mechanical properties of industrial pure iron was analyzed by means of SEM and EBSD.The high-pressure heat treatment of industrial pure iron was carried out by a CS-1 Vhexahedron pressure facility under 3,4 and 5 GPa.The results show that the martensite can be obtained by quenching the industrial pure iron at 6℃/s after austenitizing under GPa-level pressure.At 3 GPa,the quenched martensite structure of industrial pure iron presents typical low carbon martensite morphology.Its formation process is similar to that of plate martensites at 4 GPa,the preformed lath bundles penetrate the whole austenite grain which is divided,and then the subsequent lath bundles formed are limited.At 5 GPa,the "cooperative matrix" of martensite which transforms from parent phase to new phase in a cooperative way is large in number,small in size and neat,and most of them grow in trapezoid shape.The mechanical properties of industrial pure iron quenched at 5 GPa are close to that of 0.2% C steel quenched at atmospheric pressure,with hardness of 415 HV and yield strength of 700 MPa.

关 键 词：高压淬火 工业纯铁 马氏体形态 晶粒细化 硬度 

分 类 号：TG141[一般工业技术—材料科学与工程]