0Cr20Mn21Ni2N奥氏体不锈钢锻件组织性能研究  

Microstructure and Mechanical Properties of As-forged 0Cr20Mn21Ni2N Austenitic Stainless Steel

作　　者：郎宇平[1] 屈华鹏[1] 曹呈祥 陈海涛[1] 张世宵 翁宇庆[1] 

机构地区：[1]钢铁研究总院特殊钢研究所不锈钢及耐蚀合金研究室,北京100081 [2]钢铁研究总院涿州基地,河北涿州072750 [3]河北联合大学冶金与能源学院,河北唐山063000

出　　处：《热加工工艺》2015年第2期1-6,共6页Hot Working Technology

基　　金：国家海洋局公益性行业科研专项(201405013-1);"十二五"国家科技支撑计划项目(2012BAE04B01)

摘　　要：研究了无磁钻铤用0Cr20Mn21Ni2N奥氏体不锈钢圆棒锻件横截面的室温强度、硬度和韧性等力学性能,并从微观角度进行了分析。在圆棒表层区域观察到了锻造变形态晶粒组织,而直径四分之一区域为再结晶组织,平均晶粒尺寸为80μm,芯部再结晶晶粒尺寸粗化为150μm,这些差异是由不同的变形温度和降温速度造成的。这种组织差异导致的室温拉伸性能和冲击韧性也有相应的变化趋势。研究结果表明,在900、1000℃以0.5 s^＋-1的应变速率压缩的0Cr20Mn21Ni2N试验钢样品,其应力应变曲线具有一定的加工硬化特征,其芯部硬度比应变速率为0.1 s^＋-1的样品分别提升了28、15 HB。在700、800℃以20%以上的变形量进行压缩时,峰值抗力显著提高,而在900、1000℃以10%～50%的变形量进行压缩时,峰值抗力均无明显提高,可保证顺利的变形过程。The room temperature （RT） strength, hardness and toughness ofthe cross section of as-forged 0Cr20Mn21Ni2N austenitic stainless steel （ASS） rod bar was researched. The microstructure was also observed. Wrought grain was discovered at the as-forged rod bar surface area, while the recrystallized equiaxed grain with average size of 80 μm was observed at the quarter-diameter area. The coarse equiaxed grain of 150 μm was also found at the center of the rod bar. The microstructure distinction was induced by different deformation temperature and cooling rate, which can also lead to the corresponding variation of RT tensile property and impact toughness. The results show that the stress-strain curve with work hardening character is obtained after hot-deformation of 0Cr20Mn21Ni2N ASS specimen at 900℃ and 1000℃ with deforming rate of 0.5 s^＋-1. The Brinell hardness of the center part increases by 28 HB, 15 HB than that of specimen with deforming rate of 0.1 s^＋-1, respectively. The maximum resistance stress dramatically increases when the specimen is deformed at 700℃ and 800℃ with deformation greater than 20%. However, the negligible maximum resistance stress variation is noticed after the deformation temperature rising to 900 ℃ and I000 ℃ with deformation of 10%～50%, which could ensure a successful hot deformation process.

关 键 词：锻造 无磁钻铤 高N不锈钢 力学性能 

分 类 号：TB383[一般工业技术—材料科学与工程]