左鹏鹏,刘骏伟,唐剑,张璐瑶,禚孝儒,金森林

• 1:中国矿业大学材料与物理学院
• 2:浙江青山钢铁有限公司
• 3:江苏科技大学材料科学与工程学院
• 4:深圳中国计量科学研究院技术创新研究院

摘要(Abstract)：

通过微观组织观察和显微硬度测试，研究了预热温度和焊接电流两个工艺参数对4Cr5Mo2V钢表面堆焊层组织性能的影响，并通过堆焊层温度场数值模拟结果揭示了堆焊层组织和性能的演变机理。结果表明：母材未预热处理时，采用70 A的焊接电流对4Cr5Mo2V钢进行堆焊，其熔池的熔宽和熔深分别为7.0和1.5 mm,晶粒长度和宽度分别为10.9和4.0μm;增大焊接电流后，熔池峰值温度的大幅度上升使得熔池尺寸、晶粒尺寸和热影响区宽度进一步增大，从而恶化了堆焊层的性能；预热温度的升高降低了4Cr5Mo2V钢堆焊层在堆焊过程中的冷却速度，导致堆焊层平均硬度逐渐降低，450℃预热后堆焊层平均硬度降低了4.9%,母材仍保持原有的硬度水平，得到了强韧性匹配较高的堆焊层。

关键词(KeyWords)： 模具钢;预热温度;焊接电流;温度场;堆焊层

Abstract:

Keywords:

基金项目(Foundation): 深圳市自然科学基金重点项目(JCYJ20220818103601003)

作者(Author): 左鹏鹏,刘骏伟,唐剑,张璐瑶,禚孝儒,金森林

DOI: 10.13289/j.issn.1009-6264.2024-0311

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