摘要
研究了不同热处理制度对J3系列奥氏体不锈钢组织和力学性能的影响。结果表明：随着固溶温度的升高,J3钢的强度以及断后伸长率先增加后下降;而随着保温时间的增加,J3钢的强度、硬度值和屈强比均下降,断后伸长率提高。J3钢最佳固溶处理方式为1050℃×90 min。J3钢经1050℃×30 min固溶处理后,第二相的析出以及铜元素在晶界的偏聚弱化了晶间结合力,出现沿晶断裂。保温时间增加后,J3钢会呈现明显的韧性断裂,明显提高。J3钢的敏感析出温度为800℃,此时晶界最粗,并有颗粒状析出相在晶界析出,延长敏化处理时间后,析出相布满整个晶界。
Effect of heat treatment on microstructure and properties of J3 austenitic stainless steel was studied. The results show that with the increase of the solution treatment temperature,the strength and the elongation of J3 steel increase at first and then decrease. With the increase of holding time,the strength,the hardness value and the yield ratio of J3 steel decrease,and the elongation is continuously increased. The optimum solution treatment method of J3 steel is 1050 ℃ × 90 min. After 1050 ℃ × 30 min heat treatment for J3 steel,the precipitation of the second phases and the segregation of Cu at grain boundary can weaken the intergranular binding force,resulting in the occurrence of intergranular fracture. While prolonging the holding time,J3 steel shows the form of toughness fracture,and resulting in the increase of toughness. The sensitive precipitation temperature of J3 steel is 800 ℃. Therefor the grain boundary is the widest,and the granular phase precipitates. When extended the sensitizing time at 800 ℃,the precipitates filling up the whole grain boundary.
作者
李婷
王福明
Li Ting;Wang Fuming(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第9期111-117,共7页
Heat Treatment of Metals
基金
国家自然科学基金(51674020)
国家重点研发计划资助项目(2016YFB0300102)
关键词
奥氏体不锈钢
固溶处理
敏化处理
组织
力学性能
austenitic stainless steel
solution treatment
sensitization treatment
microstructure
mechanical properties
