1. I’ve heard mention of a new generation of stainless steels called super martensitic stainless…

1. I’ve heard mention of a new generation of stainless steels called super martensitic stainless steels. Please define them. 2. This question is a follow up to the March 2002 column concerning bend testing of a joint of 416 free-machining martensitic stainless steel to 304 austenitic stainless steel using 308L filler metal. The above mentioned joint was unable to pass a bend test, and you pointed out that weld cracking very likely occurred because 416 stainless is high in sulfur as a result of free machining. There is also a large mismatch in strength between the martensitic stainless and

View complete question »1. I’ve heard mention of a new generation of stainless steels called super martensitic stainless steels. Please define them. 2. This question is a follow up to the March 2002 column concerning bend testing of a joint of 416 free-machining martensitic stainless steel to 304 austenitic stainless steel using 308L filler metal. The above mentioned joint was unable to pass a bend test, and you pointed out that weld cracking very likely occurred because 416 stainless is high in sulfur as a result of free machining. There is also a large mismatch in strength between the martensitic stainless and austenitic filler metal, resulting in a strain concentration at the weld interface that makes passing a bend test difficult even if the joint is completed without defects. However, the answer was couched in terms of passing an ASME 2T bend test, which requires a minimum of 20% elongation in the materials, which is unlikely for the 416 stainless. Can you tell me what elongation is required for less ductile materials?

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