Effect of tempering time on microstructure and mechanical properties of Cr-Ni-Cu high strength steel for ships
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
采用SEM、EDS、拉伸及低温冲击等试验手段深入探究了淬、回火处理对Cr-Ni-Cu系舰船用低合金高强钢组织演变特征及力学行为影响规律.结果表明,试验钢经热轧后直接淬火及900 ℃ ×30 min水冷淬火后,显微组织均为板条马氏体和残留奥氏体,但后者较前者的-20℃低温冲击吸收能量高(分别为56 J和64 J),其主要是由于前者具有较大的马氏体板条间距.而经500℃不同时间回火后(30、60、120、240和480 min),其屈服强度、抗拉强度和低温冲击吸收能量均呈现先升高后降低趋势,其中最大抗拉强度为1021 MPa,最大屈服强度为998 MPa,最大低温冲击吸收能量为86 J.
The microstructure evolution and mechanical properties of Cr-Ni-Cu high strength steel for ships after quenching and tempering were studied by means of SEM,EDS,mechanical test and low temperature impact test.The results show that after directly quenching and quenching at 900℃ for 30 min,both the microstructure is composed of lath martensite and retained austenite,but the low-temperature impact absorbed energy of the latter is higher than that of the former at-20 ℃(56 J and 64 J,respectively),which is mainly attributed to the larger lath spacing of martensite.When tempered at 500 ℃ for 30,60,120,240 and 480 min,the yield strength,tensile strength and low-temperature impact absorbed energy of the alloy steel show a trend of increasing first and then decreasing.The maximum tensile strength is 1021 MPa,the maximum yield strength is 998 MPa,and the maximum low-temperature impact absorbed energy at-20 ℃ is 86 J.
high strength steel for shipsheat treatmentlath martensiteretained austenitemechanical properties
万方数据
