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铸辗复合成形的法兰内部存在较大的残余应力,而且晶粒尺寸分布不均,从而造成部分区域的力学性能不能满足实际要求,给应用带来安全隐患。本文以铸辗复合成形的Q235B钢法兰为研究对象,利用光学显微镜、扫描电镜和力学性能试验等方法,研究热处理工艺参数对Q235B钢法兰微观组织及力学性能的影响,探讨最佳的热处理工艺。试验结果表明:铸辗成形后的Q235B钢法兰经900℃淬火保温1 h,在10%Na Cl水溶液中冷却后600℃回火保温2 h,力学性能达到实际使用要求。
There are large residual stresses in the flanges formed by casting and rolling, and the uneven distribution of the grain size, resulting in the mechanical properties of some regions unable to meet the actual requirements and posing potential safety hazards to the applications. In this paper, casting and rolling Q235B steel flange for the research object, the use of optical microscopy, scanning electron microscopy and mechanical properties of test methods to study the heat treatment process parameters of Q235B steel flange microstructure and mechanical properties, to explore the best heat treatment Process. The test results show that the Q235B steel flanges after casting and rolling are quenched at 900 ℃ for 1 h, cooled in 10% NaCl aqueous solution and then tempered at 600 ℃ for 2 h. The mechanical properties meet the practical requirements.