中温时效对022Cr21Ni2Mn5N钢析出行为及冲击韧性的影响
发布时间:2018-06-26 13:23
本文选题:双相不锈钢 + 中温时效 ; 参考:《钢铁研究学报》2017年02期
【摘要】:采用Thermo-Calc软件对022Cr21Ni2Mn5N双相不锈钢的近平衡态析出相进行了计算分析。采用光学显微镜、透射电镜、物理化学相分析方法对经中温时效处理后试验钢第二相的析出温度、种类、数量和位置进行了观察和研究,并分析了第二相析出行为对钢的冲击韧性的影响机理。结果表明:022Cr21Ni2Mn5N双相不锈钢在600~700℃中温时效时的析出相主要为六方结构的Cr_2N相和面心立方结构的M_(23)C_6相,未见σ相析出。中温时效时,受制于该钢较低的C含量,M_(23)C_6相析出位置仅局限于相界、晶界处。该钢较高的N含量促进钢中Cr_2N相析出,并在相界、晶界和铁素体晶内均有发现。时效初期M_(23)C_6和Cr_2N均具有较高的析出速度,时效时间继续延长析出量增长放缓。时效处理时间和温度直接影响钢的冲击性能:时效初期第二相的快速析出导致钢的冲击功急剧下降;时效足够长时间,第二相析出量达到饱和,钢的冲击功趋于稳定值;并且600℃长时时效时,钢的冲击功值达到最小。
[Abstract]:The near equilibrium precipitation phase of 022Cr21Ni2Mn5N duplex stainless steel was calculated and analyzed by Thermo-Calc software. By means of optical microscope, transmission electron microscope and physicochemical phase analysis, the precipitation temperature, species, quantity and location of the second phase of the test steel after aging treatment at medium temperature were observed and studied. The influence mechanism of the second phase precipitation behavior on the impact toughness of steel was analyzed. The results show that the precipitated phases are mainly hexagonal Cr2N phase and M23 C6 phase of face-centered cubic structure at 600 鈩,
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