徐栋栋,陈学文,庞庆海,石如星,贺俊光,程振飞,孙佳伟,周正,毛怡然,周旭东

• 1:河南科技大学材料科学与工程学院
• 2:洛阳中重铸锻有限责任公司
• 3:中信重工机械股份有限公司

摘要(Abstract)：

为了深入了解SA-765 Gr.Ⅱ钢在冷却过程中的相变行为和组织演变规律，采用FTF-340型Formastor-FⅡ型全自动相变测定仪测定了SA-765 Gr.Ⅱ钢在不同冷却速度下的膨胀量-温度曲线，使用切线法确定了临界转变温度点，并结合金相检测与硬度测试，绘制出了试验钢的CCT曲线，并分析了冷却速度对其显微组织、显微硬度和CCT曲线的影响。结果表明：试验钢的临界转变温度A_(c1)为729℃,A_(c3)为830℃。在冷速为0.05～0.1℃/s时，主要发生铁素体和珠光体转变；在冷速为0.2～1℃/s时，主要发生铁素体、贝氏体和珠光体转变；在冷速为2～5℃/s时，主要发生铁素体和贝氏体转变；在冷速为10℃/s时，只发生贝氏体转变；在冷速为30～45℃/s时，主要发生贝氏体和马氏体转变。SA-765 Gr.Ⅱ钢的维氏硬度由冷却速度为0.05℃/s时的164 HV2缓慢增加到2℃/s时的207 HV2,后又快速增加至45℃/s时的365 HV2。

关键词(KeyWords)： SA-765 Gr.Ⅱ钢;CCT曲线;连续冷却;相变

Abstract:

Keywords:

基金项目(Foundation): 河南省重大科技专项(221100230200);; 国家重点研发计划(2020YFB2008400)

作者(Author): 徐栋栋,陈学文,庞庆海,石如星,贺俊光,程振飞,孙佳伟,周正,毛怡然,周旭东

DOI: 10.13289/j.issn.1009-6264.2023-0537

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