热处理对铸造双相不锈钢组织与硬度的影响  

Effect of Heat Treatment on Microstructure and Hardness of Cast Duplex Stainless Steel

作　　者：石少坤 胡建文[1,2,3] 李杰 陆子彤 SHI Shao-kun;HU Jian-wen;LI Jie;LU Zi-tong(School of Materials Science And Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China;Key Laboratory of Near Net Forming of Materials in Hebei Province,Shijiazhuang 050018,Hebei,China;Steel Ball Technology Innovation Center of Hebei Province,Handan 057650,Hebei,China)

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018 [2]河北省材料近净成形重点实验室,河北石家庄050018 [3]河北省球磨钢球技术创新中心,河北邯郸057650

出　　处：《铸造》2021年第5期521-525,共5页Foundry

摘　　要：研究了固溶和时效处理对CD-4MCu双相不锈钢的微观组织、相含量、成分及硬度的影响。结果表明:随固溶处理温度的升高,CD-4MCu双相不锈钢中α相含量增加,γ相中Cr元素含量逐渐增多,Ni含量减少,细长条棒状γ相逐渐被短棒状或块状γ相取代,而且γ相逐渐粗化;宏观硬度与α相显微硬度均随固溶温度的升高而增加,时效处理后两相晶粒内及界面上均未见碳化物的析出,但硬度较铸态和固溶态都有明显提升。时效温度为460℃时,硬度最大达HBW 350,α相显微硬度与宏观硬度变化规律一致,固溶和时效态γ相的显微硬度变化很小。CD-4MCu双相钢固溶与时效后硬度的升高均与铁素体相含量增加有关。The effects of solution heat treatment and aging treatment on the microstructures,phase content,composition and hardness of CD-4MCu duplex stainless steel were studied.The results show that content of ferrite phase in the CD-4MCu steel increase with the increasing of solution treatment temperature,and the content of Cr element in austenite phase gradually increase,while content of Ni element decrease.The thin and elongated austenite phase is gradually replaced by shorter and rounded block austenite phase,and the austenite phase particles gradually coarsen.Both bulk hardness and microhardness of ferrite phase increase with the solution temperature.After aging treatment,no secondary phase precipitation occurs in the aging temperature range from 440℃to 520℃,while the hardness is significantly enhanced compared with the as-cast and solution states.The maximum aging hardness is HBW350 at aging temperature 460℃.Consistently,the microhardness of ferrite phase is consistent with the macroscopic hardness of the aging state,while the microhardness of the austenite phase changes less both in the solution and aging state.The increase in hardness of CD-4MCu steel after solution and aging treatments is mainly related to the increase of ferrite phase content.

关 键 词：CD-4MCu 铸造双相不锈钢 显微组织 相含量 硬度 

分 类 号：TG156[金属学及工艺—热处理]