Three-step treatment of stainless steels having metastable auste

Details Three-step treatment of stainless steels having metastable auste Three-step treatment of stainless steels having metastable auste

1983-04-22

1985-01-22

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 123, 148 39, C21D 706

Patent

active

044950020

ABSTRACT:
This is a process for producing improved chloride corrosion resistance in turbine components fabricated from stainless steels which contains generally at least 1% of both a martensitic and metastable austenitic phase and comprises an initial high-intensity shot peening, followed by an aging cycle at about 980.degree.-1020.degree. F. for 1/4-4 hours and a final (lower intensity) shot peening.
A relatively homogeneous surface of aged martensite is produced and selective attack which forms sharp pit-like defects which initiate cracks is avoided.

REFERENCES:
patent: 2920007 (1960-01-01), Buckland
patent: 3073022 (1963-01-01), Bush et al.
patent: 3357458 (1967-12-01), Radd et al.
patent: 3505130 (1970-04-01), Paul
patent: 3730785 (1973-05-01), Conrad, Sr. et al.
patent: 3844846 (1974-10-01), Friske et al.
patent: 4086104 (1978-04-01), Kinoshita et al.
Shot Peening, American Wheelabrator & Equipment Corp., Mishawaka, Indiana, 1946, p. 15.
Shot Peening, The Wheelabrator Corporation, Mishawaka, Indiana, 1965, Eighth Edition, pp. 3, 34-37, 54, 130-133.

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