Si和Al对1Cr17Ni1不锈钢组织性能的影响
Effect of Si and Al on Microstructure and Properties of 1Cr17Ni1 Stainless Steel
韩 涛1, 李 宁1, 文玉华1, 林 坤2
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作者单位：1. 四川大学 制造科学与工程学院, 四川 成都 610065; 2. 东方电机有限公司, 四川 德阳 618000)
中文关键字：Si； Al； 固溶强化； 电阻率； 力学性能
英文关键字：Si; Al; solid solution strengthening; resistivity; mechanical properties
中文摘要：采用OM，SEM，电阻率测定及拉伸试验，研究了Si和Al对1Cr17Ni1铁素体-马氏体双相不锈钢组织和性能的影响。结果表明，在1000 ℃油淬并620 ℃回火的热处理制度下，添加1%Si的试样中马氏体量略有减少，此时由于Si较强的固溶强化作用使材料的强度得到明显提高；但当Si含量增加到2%时，实验钢脱离铁素体-马氏体双相区进入单相铁素体区，材料的抗拉强度急剧降低；添加1%Al的试样马氏体含量显著减少，由于其固溶强化效果不明显，因此材料抗拉强度明显降低；同时添加1%Si和1%Al试样的强度较单独添加1%Si或1%Al时要低，但塑性却有明显提高；合金的电阻率随加入Si和Al总量的增多而增大，添加2%Si可使实验钢电阻率提高62.3%。
英文摘要：The microstructure and mechanical properties of 1Cr17Ni1 ferrite-martensite dual-phase stainless steel with different Si-Al content were investigated by OM, SEM, resistivity test and unidirectional tensile test. The results show that a small amount of Si (1%) can improve the strength dramatically due to the role of solution strengthening. However the strength of the stainless steel decreases notably when the amount of Si increases to 2%, the temperature of ferrite-martensite dual-phase increases and the room-temperature microstructure is single phase ferrite at 1000℃ for 1h cooling in oil. The tensile strength of 1%Al alloy sample reduces a lot due to the decrease of martensite content and the inconspicuous solution strengthening effect. Si-Al alloy steel has excellent plasticity and low strength compared with Si alloy or Al alloy steel. The room-temperature resistivity increases with the increase of total amount of Si and Al. The resistivity is increased by 62.3% when adding 2%Si.