低温压力容器钢回火过程组织转变规律  

Microstructure Transformation in Tempering Process of Low-Temperature Pressure Vessel Steel

作　　者：陈炳张[1] 陈永利[1,2] 朱伏先[1] 巩文旭 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004 [2]天津钢铁有限公司,天津300301

出　　处：《东北大学学报（自然科学版）》2010年第3期374-377,共4页Journal of Northeastern University(Natural Science)

基　　金："十一五"国家科技支撑计划项目(2006BAE03A08)

摘　　要：以07MnNiMoVDR钢为研究对象,通过热膨胀试验、TEM检测相结合的方法,研究其回火过程中各回火温度区间中组织转变和碳化物析出的变化规律.结果表明:300℃回火时,残余奥氏体分解,片状θ-碳化物位于仍具有较高位错密度的α相板条之间;650℃回火时,α相除回复外,部分α相还发生了再结晶,析出物分布于已回复的板条之间以及再结晶晶界上.The 07MnNiMoVDR steel for low-temperature pressure vessel was investigated via thermal expansion testing in combination with TEM detection for the transformation of microstructure between different temperature intervals and change of carbide precipitation in the tempering process.The results showed that when the specimens are tempered at 300 ℃ the residual austenite is decomposed and the lamellar θ-carbides are found between α-phase laths which are still of relatively high dislocation density.When tempered at 650 ℃,the α-phase laths are recovered with part of them recrystallized.Moreover,the precipitates are distributed between the recovered α-phase laths and on the recrystallized grain boundaries.

关 键 词：07MnNiMoVDR 低温压力容器钢 回火转变 碳化物析出 马氏体 

分 类 号：TG156[金属学及工艺—热处理] TG162.83[金属学及工艺—金属学]