Research on effects of multi-pass rolling and heat treatment of cast Mn18Cr18N steel
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摘要: 对Mn18Cr18N电渣重熔钢进行三道次和五道次的轧制及固溶处理。借助电子背散射仪（EBSD）观察微观组织，发现随着轧制道次的增加，再结晶晶粒沿着晶界生长，呈现项链状分布，大角度晶界向小角度晶界逐渐迁移后趋于稳定，并出现大量剪切变形带，结果表明，较大的单道次压下量或较高的终轧温度有利于轧制后的Mn18Cr18N铸态奥氏体不锈钢再结晶。固溶处理后，发现晶粒细化并长大，退火孪晶增多，组织主要发生静态再结晶。对Mn18Cr18N钢进行力学性能测试，发现随着轧制道次的增加，抗拉强度由950 MPa增加至1 090 MPa，屈服强度增加，断后伸长率由43.46%降至29.55%，塑性降低；相应试样固溶处理后，抗拉强度由904 MPa降至870 MPa，屈服强度降低，断后伸长率由42%升高到48%，塑性提高，结果表明固溶处理改善了材料的组织和性能。
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关键词:
- Mn18Cr18N钢 /
- 轧制道次 /
- 固溶处理 /
- 微观组织 /
- 力学性能
Abstract: Mn18Cr18N electro-slag remelting steel was rolled in three or five passes and subject to solid solution treatment. The microstructure observation by electron back scattering diffraction (EBSD) indicates that with the increase of rolling passes, the recrystallized grains grow along the grain boundaries and distributes into a chain structure, and the high angle grain boundaries gradually migrate to the small angle grain boundaries and then stabilize. A large number of shear deformation bands appear. A larger single pass deformation or a higher final rolling temperature is beneficial to the recrystallization of Mn18Cr18N as-cast austenitic stainless steel after rolling. After solid solution treatment,the grain becomes fine due to increasing annealing twin grain and static recrystallization. With the increase of rolling passes, the tensile strength is increased from 950 MPa to 1090 MPa, and elongation after fracture decreases from 43.46% to 29.55%. After the solid solution treatment, the tensile strength decreases from 904 MPa for 3-passes to 870 MPa for 5-passes, with the strength decreasing; and the elongation after fracture increases from 42% to 48% accordingly. The results showes that the solid solution treatment can improve the microstructure and properties of the material.-
Key words:
- Mn18Cr18N steel /
- rolling passes /
- solution treatment /
- microstructure /
- mechanical properties
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图 1 不同状态下 Mn18Cr18N 钢的IPF图
黑色线为>15°大角度晶界，红色线为2~15°的小角度晶界
Figure 1. IPF diagrams of Mn18Cr18N steel under different states
图 2 不同状态下 Mn18Cr18N 钢的取向差分布
Figure 2. Grain boundary orientation distribution maps of Mn18Cr18N steel under different states
图 3 Mn18Cr18N 钢对应的晶粒尺寸和与其IPF图
(a) 三道次，轧制；(b)、(c)三道次，固溶状态；(d) 五道次，轧制；(e)(f)五道次，固溶状态
Figure 3. The corresponding grain size and IPF maps of Mn18Cr18N steel under different conditions
图 4 Mn18Cr18N 钢轧制及固溶后再结晶比例统计
Figure 4. Recrystallization ratio of Mn18Cr18N steel under different conditions
图 5 Mn18Cr18N钢在不同压下率的力学性能
Figure 5. Mechanical properties of Mn18Cr18N steel at different reduction rates
表 1 Mn18Cr18N 钢的化学成分
Table 1. Chemical composition of Mn18Cr18N steel
% Mn Si Ni Cr Mo Al N Ti Fe 19.3 0.6 0.2 20.1 0.02 0.03 0.6 0.016 其他 
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表 2 Mn18Cr18N 钢在不同状态下的抗拉强度、屈服强度和断后伸长率
Table 2. Tensile strength, yield strength and total elongation of Mn18Cr18N steel obtained under different states
轧制后 固溶后 抗拉强度/
MPa屈服强度/
MPa断后伸长率/% 抗拉强度
/MPa屈服强度
/MPa断后伸长率
/%三道次 950 864 43.46 904 579 42 五道次 1090 1015 29.55 870 533 48
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