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利用OM,SEM,EDS和硬度测试等分析手段,研究了含铝1.2367钢热处理中退火组织及淬火组织转变规律,并利用Thermo-Calc软件对钢中合金相的变化规律进行了计算。结果表明:添加铝不改变1.2367钢平衡相的种类,但能提高钢的Ac1点,使α→γ转变的温度区间变宽;铝的添加在偏析严重区域引起了非平衡结晶产生了液析碳化物,同时减少了退火过程中合金碳化物析出的数量;当低温淬火时,铝的添加降低了淬火硬度,在Mo和V的复合作用下提高了碳化物的溶解温度,由于未溶碳化物的钉扎作用延缓了晶粒的粗化;进一步增加淬火温度,碳化物大量溶解,但由于偏析导致偏析带上的未溶碳化物分布不均匀,再加上部分氧化铝和氮化铝的作用,引起了混晶。
The transformation rules of annealed microstructure and quenched microstructure of 1.2367 steel with aluminum were studied by means of OM, SEM, EDS and hardness test. The variation of alloy phase in the steel was calculated by Thermo-Calc software. The results show that adding aluminum does not change the type of the equilibrium phase of 1.2367 steel but increases the Ac1 point of the steel and broadens the temperature range of α → γ transformation. The addition of aluminum in the severe segregation area causes the non-equilibrium crystallization to produce hydrocracking While reducing the amount of precipitation of alloy carbides during annealing; when low temperature quenching, the addition of aluminum reduces the quenching hardness, the dissolution temperature of the carbides increases under the combined effect of Mo and V, Pinning slowed the grain coarsening; to further increase the quenching temperature, a large number of dissolved carbides, but due to segregation led to the uneven distribution of undissolved carbides, coupled with part of the role of alumina and aluminum nitride, Cause mixed crystal.