高镍奥氏体铸铁组织

leeyoung007

材料化学成分要求：C:max.3; Si:2~3;Mn:6~7;Ni:12~14. 铸件，估计铸造后没经过热处理。组织是奥氏体基体+块状碳化物+晶界碳化物。有懂该材料的吗？

leeyoung007

用苦味酸腐蚀的，对于腐蚀这种材料，有更好的腐蚀剂吗？

leeyoung007

碳化物呈枝晶形态分布。

ljlccy

枝晶型态没看出来，倒是觉得球状石墨一大堆。

leeyoung007

Hello metallurgical wizards!! The material is Austenitic cast iron. The chemical composition limits are C: max.3.0%; Si: 2%~3%; Mn: 6%~7%; Ni: 12%~13%. The delivery condition of the product is unknown (The customer did not give me heat treatment process). The appearance of the micro-structure is austenite + graphite + white nubby structure (Marked with Zone 1 in Fig.100 006) surrounded by granular particles (Marked with Zone 2 in Fig.100 006). The HV0.3 hardness in zone 1 is about 500; about 240 HV0.3 in zone 2; about 180 HVO.3 in the austenite (white area). I think the Zone 2 is carbide within austenite. Is the Zone 1 steadite (P-Fe) or carbide? i do not have the SEM to analyze the chemical composition of the zone. Any comments is appreciated.