摘要
利用光学显微镜、扫描电镜等研究了9Cr-1.7W-0.4Mo-Co铁素体耐热钢在700℃等温时效条件下的显微组织演变规律,并就时效的硬度变化及组织中元素分布进行了分析。研究结果表明,9Cr-1.7W-0.4Mo-Co铁素体耐热钢组织随着等温时效的进行发生了回复再结晶,马氏体板条尺寸增大,M_(23)C_6和MX沉淀相的析出数量、颗粒尺寸均明显增加。铁素体晶界周围析出大量的M_(23)C_6相,并且还在晶粒内部发现了MX相。时效初期的维氏硬度值增大,随后逐渐降低并最终趋于稳定。
The microstructure evolutions of 9Cr-1. 7W-0. 4Mo-Co ferritic heat-resistant steel during isothermal aging were investigated by optical microscope( OM),scanning electron microscope( SEM). In addition,the vicker's hardness of the steel and the distribution of alloying elements were analyzed,respectively. The occurance of recovery and recrystallization with the duration of isothermal aging can be found,and the width of martensitic plates increases. The density and particle size of precipitates( such as M23C6,MX) also increase sharply with the increase of aging time. Most of M23C6 phase and MX phase are precipitated around ferritic grain and in the ferritic grain,respectively. The vicker's hardness firstly increases,and then decreases to a stable value during isothermal aging.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第S2期81-87,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51501034)
河北省自然科学基金-钢铁联合研究基金(E2014501056)
河北省教育厅高等学校科学研究青年基金(QN2014338)
中央高校基本科研业务费(N142303001)
