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采用光学显微镜、扫描电镜、拉伸测试、杯突实验和耐蚀实验等分析了不同Cu含量对Cr21铁素体不锈钢的组织、力学性能、成形性能和耐蚀性能的影响。结果表明,含0.36%Cu的Cr21铁素体不锈钢晶粒大小均匀,屈强比最小,伸长率达到35.7%,塑性应变比达到最大值为1.82,杯突IE值达到8.51,γ纤维织构{111}<112>的强度最高达23.1,具有最佳的力学性能和成形性能。当Cu含量超过0.36%时,{111}<112>织构强度出现明显下降的趋势,而{112}<110>和{001}<110>织构强度增加。当Cu含量超过1.08%时,Cr21铁素体不锈钢的点蚀电位增加明显,耐蚀性能随实验钢中固溶的Cu含量的增加而增大。
The effects of Cu content on microstructure, mechanical properties, formability and corrosion resistance of Cr21 ferritic stainless steel were analyzed by optical microscopy, scanning electron microscopy, tensile test, cup test and corrosion test. The results show that the grain size of Cr21 ferritic stainless steel containing 0.36% Cu is the smallest, the yield ratio is the smallest, the elongation is 35.7%, the plastic strain ratio reaches the maximum value of 1.82, the cupping IE value reaches 8.51, γ fiber texture The strength of {111} <112> is up to 23.1 with the best mechanical properties and formability. When Cu content exceeds 0.36%, the texture strength of {111} <112> tends to decrease obviously, while the texture strength of {112} <110> and {001} <110> increases. When the Cu content exceeds 1.08%, the pitting potential of Cr21 ferritic stainless steel increases obviously, and the corrosion resistance increases with the increase of Cu concentration in the experimental steel.