| 高硅型低碳马氏体钢的相变、韧性及回火脆 | |
| 李蕴欣 | |
| Subtype | 硕士 |
| Thesis Advisor | 王仪康 |
| 1988 | |
| Degree Grantor | 中国科学院金属研究所 |
| Place of Conferral | 中国科学院金属研究所 |
| Abstract | 用高倍透射电镜，X光，电解分析，等方法研究了一种高硅低碳马氏体合金钢-24SiMnNi_2CrMoA的相变，组织强韧性，和其回火脆机制。结果表明，这种钢有相当慢的相变临界冷却度（V_c = 3 ℃/秒）。其马氏体相变取向导主要遵循K-S关系和西山关系，但也发现有其它近似于两者的取向关系，其惯习面均为{111}r。这种钢之所以具有很优越的强韧性配比是由于它的“复合组织”，即，低碳马氏体板条同在基体中体积份量为5～8%的连续的残余奥氏体薄膜混夹在一起。这在一般（低硅）的低碳中合金钢中是很罕见的。这种钢的“350 ℃回火脆”是由于残余奥氏体的分解和马氏体中的碳化物沉淀析出这两个相互关联的因素所导致的。通过等温淬火可以把这种回火脆的发生温度上移，并把这种回火脆的发展温度局限在400～600 ℃之间。 |
| Other Abstract | The mechanism of phase transformation, matrix toughness, and temper embrittlement of a high silicon type tow carbon martensite alloy steel - 24SiMnNi_2CrMoA were investigated through fine microstructure inspection by high magnitude transmission electron micropscopy, X - ray diffraction, electrolysed residue analysis, etc.. Results show that this steel has relatively slow critical cooling rate (V_e = 3 ℃/Sec) of phase transformation. The Martensite transformation orientation relationships chiefly obey KURDJUMOV - SACHS and NISHIYAMA - WASSERMAN relations but some other approximate relations also appear. In all cases, the habit plane is {111} r. The excellent combination of high strength and toughness of this steel is on account of its composite matrix, viz. the low carbon Martensite laths are mingled with continuous retained Austensite film of 5 ～ 8% volume fraction in the matrix which is hardly discovered in the ordinary low carbon middle alloy steels. The temper embrittlement of this steel is chiefly due to two correlated factors, viz. the decompositon of retained Austenite and the precipitation of carbide from Martensite. The "350 ℃ Temper Embrittlement" of this steel can be pushed up and confined within a narrow temperature range, viz. 400 ～ 600 ℃, through isothermal quenching. |
| Pages | 78 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/17386 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | 李蕴欣. 高硅型低碳马氏体钢的相变、韧性及回火脆[D]. 中国科学院金属研究所. 中国科学院金属研究所,1988. |
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