在杭钢集团大生产的条件下,分析了不同铝含量对退火后GCr15钢带的织构、金相组织、晶粒取向、硬化指数n和塑性应变比r以及凸耳指数△r的影响.试验结果表明:在[Al]_s的质量分数为0.017%～0.027%时,铝对高碳的GCr15钢带的深冲成型性能影响规律与铝对低碳钢板基本一致,随着钢中铝含量的升高,r值升高,且{111}面有利织构含量增加,但相同铝含量下GCr15钢的r值比低碳钢却要小很多,"值则相差不大,△r指数比低碳钢更小,晶粒取向也有明显的区别,说明高碳的GCr15钢各向性能比较均匀,能满足一般用途的深冲成型要求.
The effects of different aluminum content in annealed GCr15 drawing steel on the variation of strip texture,microstructure,gain orientation,hardenability n-value,plastic strain ratio r-value and △r index were investigated under the condition of mass production in Hangzhou Iron and Steel Group Co.Experimental results show that within the range of[Al]_s of 0.017%-0.027%,the influence of aluminum on the property of deep-drawing formed GCr15 with high carbon and with low carbon is basically the same.The r-value increases with the increase in aluminum content,while the beneficial texture on{111}also goes up.However,the r-value of GCr15 steel is much less than that in the low-carbon steel with the same degree of aluminum.While n-value remains more or less the same,△r index is much smaller,and there is some significant difference in grain orientation.All results indicate that GCr15 with high carbon has good properties in the above-mentioned aspect,which can meet the requirements of deep forming for common purposes.
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