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一、前言对于冲击韧性与金相组织的关系,已经有了许多报道。一般认为,细小针状铁素体组织具有较好的冲击韧性;板条状马氏体组织能达到冲击韧性与硬度的良好配合;贝氏体组织韧性次于板条马氏体,其中上贝氏体韧性次于下贝氏体。一般不希望焊缝金属中出现上贝氏体组织。对贝氏体与马氏体混合组织,有些研究者认为贝氏体的介入降低了马氏体组织的韧性,但混合组织的韧性仍高于贝氏体组织。本文采用Gleeble-1500热力学模拟试验机进行了大量铝热焊焊缝焊后热处理热模拟试验。并对热模拟试样进行了冲击韧性试验,试
I. INTRODUCTION Much has been reported about the relationship between impact toughness and microstructure. Generally believed that the fine acicular ferrite has good impact toughness; lath martensite can achieve good impact toughness and hardness; bainitic tissue toughness lath martensite, which on the shell Toughness is inferior to lower bainite. Generally do not want to appear in the weld metal bainite. For bainite and martensite mixed tissue, some researchers believe that bainite intervention reduces the toughness of martensite, but the toughness of mixed tissue is still higher than that of bainite. In this paper, Gleeble-1500 thermodynamic simulation testing machine for a large number of aluminum heat welding heat treatment after welding heat simulation test. And the thermal simulation of the impact toughness test specimens, test