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采用Q&PB和I&Q&PB工艺,研究低碳硅锰贝氏体钢经Q&PB和I&Q&PB工艺处理后的组织性能。结果表明:试验钢通过两种工艺热处理后均得到粒状贝氏体和板条状贝氏体组织,且经I&Q&PB工艺热处理后得到的板条状贝氏体更多;Q&PB工艺热处理后残留奥氏体量仅为8.19%,I&Q&PB工艺热处理后残留奥氏体量高达12.08%。两种工艺下测试力学性能,I&Q&PB试样的抗拉强度为900 MPa,伸长率高达27%,Q&PB试样的抗拉强度为920 MPa,伸长率为22%,经过两相区Mn配分强塑积提高4060 MPa·%。
The Q & PB and I & Q & PB processes were used to study the microstructure and properties of low carbon Si-Mn bainitic steels treated with Q & PB and I & Q & PB processes. The results show that granular bainite and lath-like bainite are obtained after the heat treatment of the test steel by two kinds of processes, and the lath bainite obtained after the I & Q & PB heat treatment is more; the retained austenite after the Q & PB process heat treatment The volume of only 8.19%, I & Q & PB heat treatment of retained austenite up to 12.08%. Tensile strength of I & Q & PB samples was 900 MPa, elongation was up to 27%, tensile strength of Q & PB samples was 920 MPa and elongation was 22% Strong plastic product increased by 4060 MPa ·%.