摘要
利用EBSD技术开发了一种残留奥氏体(以下简称残奥)形态、尺寸的定量分析方法,并用该方法结合XRD法对Q&P钢中残奥的机械稳定性进行了研究。研究表明,在变形的初期,Q&P钢残奥的机械稳定性首先受其碳含量的影响,碳含量越低,残奥的稳定性越差。在变形的初期这部分含碳量低的残奥会首先发生马氏体转变。在Q&P钢变形的不同阶段,各种尺寸、各种形态的残奥的稳定性会发生变化。Q&P钢中长宽比大于5的残奥的稳定性最差,在拉伸变形的初期这部分残奥会优先转变成马氏体,相对转变量超过47%。尺寸过小或过大的残奥都不是很稳定,在拉伸的初期就容易发生马氏体转变。
A new quantitative method was developed to analyze the shape and size of retained austenite by using EBSD. In combination with XRD,the stability of retained austenite in quenching and partitioning( Q&P) steel was researched. The results show that,at the beginning of deformation the stability of retained austenite is first affected by the carbon content. The lower the carbon content is,the poorer the stability of retained austenite is. The retained austenite with low carbon content can fist transform into martensite at the beginning of deformation. During different stage of deformation of Q&P Steel,the stability of retained austenite with different shape and size can be changed. The stability of retained austenite with aspect ratio greater than 5 is the worst,47% of which can transform into martensite at the beginning of deformation. It is also concluded that the retained austenite is not stable when its size is too small or too big,which can easily transform into martensite at the beginning of deformation.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第10期119-124,共6页
Transactions of Materials and Heat Treatment
关键词
Q&P钢
残奥
形态
尺寸
EBSD
(quenching and partitioning steel) Q&P steel
retained austenite
shape
size
EBSD
