东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (5): 643-651.DOI: 10.12068/j.issn.1005-3026.2024.05.005
• 材料与冶金 • 上一篇
张九鑫, 任潇健, 金东正, 田勇
收稿日期:
2022-12-12
出版日期:
2024-05-15
发布日期:
2024-07-31
作者简介:
张九鑫(1997-),男,辽宁葫芦岛人,东北大学硕士研究生基金资助:
Jiu-xin ZHANG, Xiao-jian REN, Dong-zheng JIN, Yong TIAN
Received:
2022-12-12
Online:
2024-05-15
Published:
2024-07-31
摘要:
常规工艺下特厚船舶用钢奥氏体晶粒细化的程度受限,导致极小尺寸奥氏体晶粒对钢板组织性能的影响尚不明确.利用二次奥氏体化法和热机械控制工艺,研究了细化奥氏体晶粒对特厚EH47止裂钢的显微组织演化及力学性能的影响.结果表明:试轧钢的加热温度从890 ℃升高至1 050 ℃时,原奥氏体晶粒尺寸从14 μm增加至28 μm;铁素体含量的降低导致大角度晶界数量比例由57.4%降低至40.5%;马氏体/奥氏体(martenite/austenite,M/A)岛体积分数从2.0%增加至6.5%;钢板的屈服强度从440 MPa提高到488 MPa.890 ℃轧制钢板的单位体积有效晶界面积为269.0 mm-1,是其显微组织细化、均匀化,并在-100 ℃时具有241 J的冲击功的重要原因.
中图分类号:
张九鑫, 任潇健, 金东正, 田勇. 奥氏体晶粒细化对特厚EH47止裂钢组织性能的影响[J]. 东北大学学报(自然科学版), 2024, 45(5): 643-651.
Jiu-xin ZHANG, Xiao-jian REN, Dong-zheng JIN, Yong TIAN. Effect of Austenite Grain Refinement on Microstructure and Properties of Ultra‑Heavy EH47 Crack Arrest Steel[J]. Journal of Northeastern University(Natural Science), 2024, 45(5): 643-651.
C | Si | Mn | P | S | Nb+Ti | Ni+Cr+Cu |
---|---|---|---|---|---|---|
0.05 | 0.15 | 1.95 | 0.008 | 0.002 | 0.052 | 1.03 |
表1 EH47连铸坯的化学成分(质量分数) (casting slab (mass fraction) %)
Table 1 Chemical composition of the EH47 continuous
C | Si | Mn | P | S | Nb+Ti | Ni+Cr+Cu |
---|---|---|---|---|---|---|
0.05 | 0.15 | 1.95 | 0.008 | 0.002 | 0.052 | 1.03 |
编号 | 平均弦长/μm | 最大尺寸/μm | 体积分数/% |
---|---|---|---|
T890 | 1.4 | 5.5 | 2.0 |
T970 | 2.5 | 6.3 | 5.5 |
T1050 | 3.5 | 9.9 | 6.5 |
表2 试轧钢的M/A岛的参数
Table 2 Parameters of the M/A island of test rolled steels
编号 | 平均弦长/μm | 最大尺寸/μm | 体积分数/% |
---|---|---|---|
T890 | 1.4 | 5.5 | 2.0 |
T970 | 2.5 | 6.3 | 5.5 |
T1050 | 3.5 | 9.9 | 6.5 |
图2 试轧钢1/2厚度的反极图、晶界分布图和位错分布图(a)—T890反极图; (b)—T890晶界分布图; (c)—T890位错分布图; (d)—T970反极图; (e)—T970晶界分布图;(f)—T970位错分布图; (g)—T1050反极图; (h)—T1050晶界分布图; (i)—T970位错分布图.
Fig.2 Inverse pole figure, grain boundary figures and dislocation distribution figures at 1/2 thickness of test rolled steels
图4 试轧钢1/2厚度的<110>//RD和<001>//RD取向分布和体积分数(a)—T890取向分布; (b)—T970取向分布; (c)—T1050取向分布; (d)—<110>//RD和<001>//RD取向的体积分数.
Fig.4 Orientation distribution and volume fraction of <110>//RD and <001>//RD at 1/2 thickness of test rolled steels
图5 试轧钢的原奥氏体晶粒形貌和不同尺寸晶粒的体积分数(a)—T890原奥氏体晶粒形貌; (b)—T970原奥氏体晶粒形貌;(c)—T1050原奥氏体晶粒形貌; (d)—不同尺寸晶粒的体积分数.
Fig.5 Prior‐austenite grain morphology and the volume fraction of different grain sizes for test rolled steels
编号 | 屈服强度 | 抗拉强度 | 延伸率/% | 屈强比 |
---|---|---|---|---|
MPa | MPa | |||
T890 | 440 | 587 | 26.1 | 0.75 |
T970 | 467 | 610 | 26 | 0.76 |
T1050 | 488 | 636 | 23.3 | 0.77 |
表3 试轧钢的拉伸测试结果
Table 2 Tensile test results of test rolled steels
编号 | 屈服强度 | 抗拉强度 | 延伸率/% | 屈强比 |
---|---|---|---|---|
MPa | MPa | |||
T890 | 440 | 587 | 26.1 | 0.75 |
T970 | 467 | 610 | 26 | 0.76 |
T1050 | 488 | 636 | 23.3 | 0.77 |
图9 不同奥氏体化温度下析出相的形貌和EDS能谱(a)—T890析出相形貌; (b)—T890 EDS能谱; (c)—T970析出相形貌;(d)—T970 EDS能谱; (e)—T1050析出相形貌; (f)—T1050 EDS能谱.
Fig.9 Morphology and EDS energy spectra of precipitated phases at different austenitization temperatures
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