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用两种不同的试验方法,即带有尖锐缺口的室温冲击试验和带有缺口于-80℃下进行快速拉伸试验,对15A深冲弹钢中两种不同的铁素体形态(魏氏铁素体及状块铁素体)进行了材料脆化倾向的研究。结果表明,在原奥氏体晶粒大小相同的条件下,具有魏氏铁素体的试样其脆化倾向较小,而块状铁素体试样的脆化倾向较大。本文对这些结果作了进一步的讨论。 关于15A和20A深冲弹钢中出现魏氏组织对冲击韧性和脆性转变温度的影响,近两年来国内曾有过多次研究。〔1〕〔2〕他们的结果均表明,在具有魏氏铁素体组织的试样中,其中冲击值均比不具有魏氏组织的块状铁素体为高,且脆性转变温度比块状铁素体的为低。近年来为了提高热轧钢板的韧性,采用轧后快冷,获得针状铁素体组织〔3〕。 为了进一步弄清深冲弹钢中魏氏组织对机械性能的影响,使含有魏氏组织和不含魏氏组织(块状铁素体)的脆化趋势更加明显,本文从两个方面进行了研究:一为带有尖锐缺口的冲击试验,一为在-80℃对带有缺口的试样塑性和韧性降低的缺口敏感性。由于单纯室温缺口冲击试验使材料脆化的趋势,没有用降低温度的方法使材料脆化来得显著,故又采取了降低温度和快速形变结合的方式,使具有魏氏组织和不含魏氏组织的脆化倾向更趋明显,以便更好的进行比较。 本文从力性实验?
Two different ferrite morphologies (WEI’s model of 15A deep-drawing steel with two different test methods, room temperature impact test with sharp notch and rapid tensile test with notch at -80 ℃ Ferrite and massive ferrite) to study the material embrittlement tendency. The results show that the austenite grain size of the same conditions, with Wei Shi ferrite samples tend to embrittlement less prone to massive ferrite samples embrittlement tendency. These results are further discussed in this paper. About 15A and 20A deep-drawn steel appears Wei’s organization on the impact toughness and brittle transition temperature, in the past two years there have been many studies. 〔1〕 〔2〕 Their results show that in the samples with Weisner’s ferrite structure, in which the impact values are higher than that of the non-Wyster’s massive ferrite, and the brittle transition temperature is higher than that of the bulk Ferrite is low. In recent years, in order to improve the toughness of hot-rolled steel, the use of fast cooling after rolling to obtain acicular ferrite [3]. In order to further clarify the impact of Wei’s microstructure on the mechanical properties of deep-drawn steel, the tendency of embrittlement containing Widmanstatten and non-Widmanstatten (bulk ferrite) is more obvious. This article is conducted from two aspects Study: One is the impact test with a sharp notch, and the other is the notch sensitivity of the notched specimen at -80 ° C with reduced ductility and toughness. As a result of simple room temperature notched impact test of material embrittlement trend, there is no way to reduce the temperature to make the material embrittlement significantly, so it has taken to reduce the combination of temperature and rapid deformation, with Wei’s tissue and non-Wei tissue The embrittlement tendencies become more apparent in order to better compare. This article from the force experiment?