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34-1对下列5条条文中,请选择(a)- (f)与低碳钢焊接热影响区组织名称关系最密切的语句代号,并填入括号中。 (1)焊接金属部分( ) (2)粗晶粒区( ) (3)细晶粒区( ) (4)粉状珠光体区( ) (5)混合晶粒区( )语句:(a)熔化、 (b)经过淬火或变形时效而硬化 (c)经再结晶细化、韧性等良好 (d)加热到750～900℃ (e)加热到1250℃以上 (f)是指粗晶粒和细晶粒混合的部分,其性质介于粗晶粒区和
34-1 For the following five articles, select the words (a) - (f) that have the closest relationship to the tissue name of the heat-affected zone for welding mild steel and enclose it in brackets. (1) Welded metal parts (2) Coarse grain zone (3) Fine grain zone (4) Powdered pearlite zone (5) Mixed grain zone () Statement: (a) (D) Heated to 750-900 ° C (e) Heated to 1250 ° C or higher (f) refers to coarse grains and Fine grain mixed part of the nature of the coarse grain region and