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16Mn钢奥氏体化后冷却时,随等温温度降低及冷却速度加快,显微组织由块状铁素体变成魏氏组织;而魏氏组织中的针状铁素体由交叉分布变成平行分布。我们过去的工作表明,当形成以交叉针状铁素体为主的魏氏组织时,钢材的抗冷脆性最好。本文研究了16Mn钢中交叉针状魏氏组织的形成条件,提出了采用“双段控冷工艺”,可在较宽的工艺条件下得到交叉针状魏氏组织。
When the 16Mn steel is austenitized and cooled, the microstructure changes from massive ferrite to Westeinian structure as the isothermal temperature decreases and the cooling rate increases. However, the acicular ferrite in the Westend tissue changes from cross-distribution to Parallel distribution. Our past work shows that when the formation of cross-acicular ferrite-based Wei’s organization, the best cold-resistant steel brittleness. In this paper, the formation conditions of cross-needle Widmanstatches in 16Mn steel were studied. It was proposed that the cross-needle Widmanstatten could be obtained under a wide range of process conditions by the “two-stage controlled cooling process”.