时效处理对CD4MCuN双相不锈钢硬度的影响  

Effect of Aging Treatment on Hardness of CD4MCuN Duplex Stainless Steel

作　　者：邵世单[1] 王灵水 范芳雄 沈军[2] SHAO Shidan;WANG Lingshui;FAN Fangxiong;SHEN Jun(Luoyang Ship Material Research Institute, Luoyang 471300, China;School of Materials, Northwestern Polytechnical University, Xi'an 710072, China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471300 [2]西北工业大学材料学院,陕西西安710072

出　　处：《热加工工艺》2019年第12期135-138,142,共5页Hot Working Technology

基　　金：河南省科技攻关项目(172102210413)

摘　　要：对CD4MCuN双相不锈钢进行了不同温度下的时效处理。结果表明:中温时效可提升CD4MCuN双相不锈钢硬度,且随时效时间的延长而提高。当时效温度为490℃、时效时间为4 h时,硬度可提升至接近31 HRC,较固溶态提高7 HRC;高温时效对CD4MCuN双相不锈钢的硬度影响不大,且随时效时间的延长而小幅降低。中温时效硬度的提升源于纳米级ε-Cu相的弥散析出。高温时效虽有硬质σ相的析出,但因其析出量较少而对硬度影响有限。高温时效时铁素体含量随时效时间的延长而少量降低,受此影响,高温时效硬度会随时效时间的延长而小幅降低。The aging treatment of CD4MCuN duplex stainless steel at different temperatures was carried out. The results show that, the hardness of CD4MCuN duplex stainless steel can be increased by aging at moderate temperature, and with the increase of aging time the of hardness of duplex stainless steel increase. When the aging temperature is 490 ℃ and the aging time is 4 h, the hardness can be raised to nearly 31 HRC, 7 HRC higher than that of solid solution. High temperature aging has little effect on the hardness of CD4MCuN duplex stainless steel, and decreases slightly with the prolongation of aging time.The enhancement of aging hardness at intermediate temperature is due to the dispersion precipitation of ε-Cu phase at nanometer level. Although during high temperature aging hard σ phase precipitates, it has limited influence on hardness due to its small amount of precipitation. The ferrite content decreases slightly with the prolongation of the aging time at high temperature. By this effect, the hardness of high temperature aging slightly reduced with the increase of aging time.

关 键 词：双相不锈钢 CD4MCuN 时效处理 

分 类 号：TG156.92[金属学及工艺—热处理] TG142.71[金属学及工艺—金属学]