热处理对高强00Cr18Ni10N不锈钢丝组织与性能的影响

Influence of Heat Treatment on Microstructure and Mechanical Property of High Strength 00Cr18Ni10N Stainless Steel Wire

对面缩率分别为36%、67.3%与84%的00Cr18Ni10N冷拔不锈钢丝进行热处理,并对处理后的试样进行拉伸试验、磁性实验与显微组织观察。结果表明:对于α'含量较少的00Cr18Ni10N,通过热处理可使该钢丝的抗拉强度维持在1000MPa,伸长率达到10%以上。回复过程中形变孪晶等形变组织的稳定存在是使强度保持稳定的主要原因,伸长率的提高则是由于在热处理过程中空位等点缺陷的湮灭与重组所致;对α'含量较高的00Cr18Ni10N,热处理过程中首先发生逆转变,随α'含量的减少,抗拉强度由冷拔态的最高值下降到1300MPa,逆转变过程中伸长率没有明显的提高,逆转变结束之后伸长率开始上升。当抗拉强度下降到900MPa时,伸长率可提高到30%,这是由于经大变形热处理后,在再结晶初期形成了细小的等轴晶粒所致。

Cold drawn stainless steel （00Cr18Ni10N） wires with different reductions of area （36%, 67.3% and 84%） were heat treated at different temperature. The tensile test, magnetic test and microstructure observation of sample were carried out. The results show that： While the wire has little content of α′, deformation twins and the other deformation structures which have stability in recovery keep the wire with a high strength （1000 MPa）. An increased elongation （above 10%） can be gained from recovery. While the wire contains much α′,the reverse transformation （α′→γ） occurs firstly. Tensile strength decreases （to 1300 MPa） along with the decrease of α′. The elongation doesn＇t improve obviously until the reverse transformation is finished. The elongation can be improved to 30% when the tensile strength decreases to 900 MPa, and this improvement owes to the fine equiaxed grains which forms at the initial stage of recrystallization.