热处理
熱處理
열처리
HEAT TREATMENT
2014年
5期
24-31
,共8页
过冷奥氏体%贝氏体%过渡性%马氏体%珠光体
過冷奧氏體%貝氏體%過渡性%馬氏體%珠光體
과랭오씨체%패씨체%과도성%마씨체%주광체
supercooled austenite%bainite%transient characteristics%martensite%pearlite
对35 CrMo钢等多种材料奥氏体化后进行贝氏体等温淬火，得到少量贝氏体＋马氏体＋残留奥氏体的整合组织。应用JEM-2100透射电镜和QUANTA-400环扫电镜等设备观察了贝氏体组织的形貌和亚结构。综合分析了贝氏体相变的特征。研究表明，过冷奥氏体随着温度的降低具有转变贯序，贝氏体相变在组织形貌、亚结构方面具有过渡性。贝氏体相变动力学具有交叉性、重叠性、变温性和等温性的过渡性特征。贝氏体相变中铁原子和置换原子以非协同热激活跃迁方式位移，表明贝氏体形核长大具有过渡性。
對35 CrMo鋼等多種材料奧氏體化後進行貝氏體等溫淬火，得到少量貝氏體＋馬氏體＋殘留奧氏體的整閤組織。應用JEM-2100透射電鏡和QUANTA-400環掃電鏡等設備觀察瞭貝氏體組織的形貌和亞結構。綜閤分析瞭貝氏體相變的特徵。研究錶明，過冷奧氏體隨著溫度的降低具有轉變貫序，貝氏體相變在組織形貌、亞結構方麵具有過渡性。貝氏體相變動力學具有交扠性、重疊性、變溫性和等溫性的過渡性特徵。貝氏體相變中鐵原子和置換原子以非協同熱激活躍遷方式位移，錶明貝氏體形覈長大具有過渡性。
대35 CrMo강등다충재료오씨체화후진행패씨체등온쉬화，득도소량패씨체＋마씨체＋잔류오씨체적정합조직。응용JEM-2100투사전경화QUANTA-400배소전경등설비관찰료패씨체조직적형모화아결구。종합분석료패씨체상변적특정。연구표명，과랭오씨체수착온도적강저구유전변관서，패씨체상변재조직형모、아결구방면구유과도성。패씨체상변동역학구유교차성、중첩성、변온성화등온성적과도성특정。패씨체상변중철원자화치환원자이비협동열격활약천방식위이，표명패씨체형핵장대구유과도성。
35 CrMo steel and other materials were austenitized and quenched isothermally in the bainite transformation zone,with the result that a integrated microstructure consisting of a small amount of bainite, martensite and retained austenite was developed.The morphology and substructure of the bainite were observed by JEM-2100 transmission electron microscope and QUANTA-400 environmental scanning electron microscope.The characteristics of bainite transformation were comprehensively analyzed.The results show that with the decrease in the temperature,the supercooled austenite exhibits transformation sequence,and the bainite transformation has transient characteristics in structure morphology and substructure.The bainite transformation dynamics has transient characteristics,such as intersecting,overlapping,variable- temperature and isothermal characteristics.The iron and replacement atoms will shift through the medium of non-synergic thermal activation transition during the bainite transformation,which shows the transient characteristics of the nucleation and growth of the bainite.
